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A185821 1/5 the number of nX5 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 0
9, 5680, 1266624, 378212944, 100480040192, 28043363244452, 7662203273902712, 2112817100467905536, 580282378007177354752, 159650092398206756238532, 43890600560593534666234904, 12070254095603726713513018032 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A185825
LINKS
EXAMPLE
Some solutions for 4X5 with a(1,1)=0
..0..0..0..2..2....0..0..4..4..0....0..0..3..3..2....0..0..3..3..2
..0..1..0..4..4....0..1..3..4..0....0..1..3..3..2....0..1..0..0..2
..0..1..0..3..3....0..1..3..3..4....0..1..0..2..4....0..1..0..2..4
..0..0..0..1..1....0..0..0..0..4....0..0..0..2..4....0..0..0..2..4
CROSSREFS
Sequence in context: A125541 A151581 A145263 * A133248 A125542 A349876
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 05 2011
STATUS
approved

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Last modified June 13 22:21 EDT 2024. Contains 373391 sequences. (Running on oeis4.)