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A302161
Number of nX6 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
13, 65, 34, 109, 296, 635, 1563, 3948, 9405, 22602, 55730, 135448, 327429, 798275, 1944498, 4720205, 11478126, 27935558, 67913732, 165112453, 401615997, 976675958, 2374829337, 5775344378, 14045080684, 34154018024, 83055854601
OFFSET
1,1
COMMENTS
Column 6 of A302163.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) +8*a(n-3) -5*a(n-5) -17*a(n-6) -2*a(n-7) +6*a(n-8) +10*a(n-9) +a(n-10) -a(n-11) +a(n-12) -a(n-14) -a(n-15) for n>26
EXAMPLE
Some solutions for n=5
..0..1..1..0..1..0. .0..1..0..1..0..1. .0..1..1..0..1..0. .0..1..0..1..0..1
..1..0..1..0..1..0. .0..1..0..1..1..0. .1..0..1..0..1..0. .1..1..0..1..0..0
..1..0..1..0..1..0. .0..1..1..0..1..0. .1..0..1..0..1..1. .0..1..0..1..0..1
..1..0..1..0..1..1. .1..0..1..0..1..0. .0..0..1..0..1..0. .0..1..0..1..0..1
..1..0..1..0..1..0. .1..0..1..0..0..1. .1..0..1..0..1..0. .0..1..0..0..1..1
CROSSREFS
Cf. A302163.
Sequence in context: A169883 A220564 A264513 * A302633 A302425 A303195
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2018
STATUS
approved