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A185538 1/6 the number of nX5 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 0
11, 12105, 4403225, 2241330570, 994633804270, 468362874353295 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A185540
LINKS
EXAMPLE
Some solutions for 3X5 with a(1,1)=0
..0..0..0..4..4....0..0..3..3..5....0..0..0..3..4....0..0..0..0..1
..0..3..3..2..4....3..3..4..3..5....0..3..1..3..4....0..3..2..1..1
..0..0..0..2..2....0..0..4..4..5....0..3..1..5..5....0..3..2..5..5
CROSSREFS
Sequence in context: A228533 A088103 A180561 * A125545 A068137 A220979
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 30 2011
STATUS
approved

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Last modified February 23 07:33 EST 2024. Contains 370269 sequences. (Running on oeis4.)