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A302514
Number of nX7 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
21, 23, 118, 235, 689, 1784, 4558, 12324, 32336, 84536, 223968, 588744, 1548844, 4083686, 10742086, 28288776, 74511660, 196104792, 516398498, 1359816012, 3579887214, 9426059034, 24819072446, 65345909914, 172055547718, 453015967754
OFFSET
1,1
COMMENTS
Column 7 of A302515.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +12*a(n-3) +11*a(n-5) -38*a(n-6) -5*a(n-7) -17*a(n-8) +27*a(n-9) -32*a(n-10) +12*a(n-11) +16*a(n-12) +24*a(n-13) +16*a(n-15) for n>21
EXAMPLE
Some solutions for n=5
..0..1..0..1..0..1..0. .0..0..0..1..1..1..0. .0..1..1..1..0..1..0
..0..1..0..1..1..1..0. .0..1..0..1..0..1..0. .0..1..0..1..0..1..0
..0..1..0..0..0..1..0. .0..1..0..1..0..1..0. .0..0..0..1..0..1..0
..0..1..0..1..0..1..0. .0..1..0..1..0..1..0. .0..1..1..1..0..1..0
..0..1..0..1..1..1..0. .0..1..1..1..0..0..0. .0..1..0..1..0..1..0
CROSSREFS
Cf. A302515.
Sequence in context: A335189 A304269 A302679 * A303313 A257642 A332922
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2018
STATUS
approved