A048036 - OEIS

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A048036

Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-3)/3.

0

0, 0, 0, 0, 0, 1, 6, 21, 42, 112, 252, 378, 759, 1419, 1914, 3564, 6864, 9295, 20020, 45055, 63083, 146648, 331568, 456484, 1007454, 2156994, 2896664, 6165494, 13079094, 17441739, 37871064, 82898739, 111029050, 247813500

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OFFSET

1,7

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Sequence in context: A364171 A199194 A268223 * A272671 A272684 A180863

Adjacent sequences: A048033 A048034 A048035 * A048037 A048038 A048039

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved