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A302677
Number of nX5 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
8, 7, 18, 30, 63, 125, 257, 528, 1085, 2228, 4576, 9401, 19311, 39665, 81476, 167363, 343782, 706162, 1450533, 2979557, 6120333, 12571820, 25823881, 53045060, 108960300, 223816249, 459742831, 944361613, 1939821080, 3984602671
OFFSET
1,1
COMMENTS
Column 5 of A302680.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-3) +2*a(n-4) +2*a(n-5) for n>10
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..1..1..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..0..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..1..0..1..0
CROSSREFS
Cf. A302680.
Sequence in context: A309629 A075573 A317706 * A304267 A166138 A348673
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2018
STATUS
approved