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A265660
Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal or vertical neighbor equal to n-1.
0
0, 0, 0, 112, 4912, 265440, 31924032, 3170361984, 597787563264, 97379218955520, 26489701471180800, 6432079809975552000
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Column 2 of A265663.
LINKS
Table of n, a(n) for n=1..12.
EXAMPLE
Some solutions for n=4
..0..1....3..1....0..1....3..1....2..0....1..3....2..2....3..2....0..1....2..3
..2..0....2..0....0..1....1..0....3..2....1..3....0..0....3..2....1..0....0..1
..3..1....2..0....2..3....0..2....1..0....0..2....1..1....1..0....3..2....1..3
..2..3....3..1....2..3....2..3....3..1....0..2....3..3....0..1....3..2....0..2
CROSSREFS
Cf. A265663.
Sequence in context: A172129 A304552 A103860 * A271032 A213803 A291214
Adjacent sequences: A265657 A265658 A265659 * A265661 A265662 A265663
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 12 2015
STATUS
approved

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Last modified November 23 16:39 EST 2024. Contains 378048 sequences.
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