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approved

See A243748 for a closely related sequence.

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Charles R Greathouse IV, <a href="/A277566/b277566.txt">Rows n = 1..12 of table, flattened</a>

approved

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Götz Pfeiffer, <a href="http://schmidt.nuigalway.ie/subgroups">Numbers of subgroups of various families of groups</a>

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reviewed

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proposed

reviewed

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proposed

allocated for Charles R Greathouse IVIrregular table by rows: Orders of subgroups of the symmetric group S_n.

1, 1, 2, 1, 2, 3, 6, 1, 2, 3, 4, 6, 8, 12, 24, 1, 2, 3, 4, 5, 6, 8, 10, 12, 20, 24, 60, 120, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 16, 18, 20, 24, 36, 48, 60, 72, 120, 360, 720, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 21, 24, 36, 40, 42, 48, 60, 72, 120, 144, 168, 240, 360, 720, 2520, 5040, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 30, 32, 36, 40, 42, 48, 56, 60, 64, 72, 96, 120, 128, 144, 168, 180, 192, 240, 288, 336, 360, 384, 576, 720, 1152, 1344, 1440, 2520, 5040, 20160, 40320

1,3

Each row begins with 1 (the order of the trivial group) and ends with n! (the order of S_n itself).

1;

1, 2;

1, 2, 3, 6;

1, 2, 3, 4, 6, 8, 12, 24;

1, 2, 3, 4, 5, 6, 8, 10, 12, 20, 24, 60, 120;

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 16, 18, 20, 24, 36, 48, 60, 72, 120, 360, 720;

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 21, 24, 36, 40, 42, 48, 60, 72, 120, 144, 168, 240, 360, 720, 2520, 5040;

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 30, 32, 36, 40, 42, 48, 56, 60, 64, 72, 96, 120, 128, 144, 168, 180, 192, 240, 288, 336, 360, 384, 576, 720, 1152, 1344, 1440, 2520, 5040, 20160, 40320;

(GAP) LoadPackage("sonata");

a := function(n)

return Length(Unique(Apply(Subgroups(SymmetricGroup(n)), Size)));

end;; # Charles R Greathouse IV, Nov 28 2016

Row lengths are given by A218913.

allocated

nonn,tabf

Charles R Greathouse IV, Nov 28 2016

approved

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