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A302621
Number of nX6 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
32, 169, 146, 497, 2229, 9015, 36510, 150072, 606756, 2468992, 10053705, 40857230, 166236741, 676221120, 2750271178, 11187615465, 45506216823, 185098331538, 752909910881, 3062514905153, 12457030400283, 50670074667584
OFFSET
1,1
COMMENTS
Column 6 of A302623.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +5*a(n-2) +6*a(n-3) -34*a(n-4) -11*a(n-5) +18*a(n-6) +19*a(n-7) +14*a(n-8) +7*a(n-9) -40*a(n-10) +24*a(n-11) -4*a(n-12) -13*a(n-13) +78*a(n-14) -65*a(n-15) -58*a(n-16) +47*a(n-17) -3*a(n-18) +8*a(n-19) +6*a(n-20) -6*a(n-21) for n>27
EXAMPLE
Some solutions for n=5
..0..1..0..1..0..1. .0..1..0..1..0..1. .0..0..1..0..0..1. .0..0..1..0..1..1
..0..1..1..1..0..1. .0..1..0..1..0..1. .1..0..1..0..1..1. .1..0..1..0..1..0
..0..1..0..1..0..1. .0..1..1..1..0..1. .1..0..1..0..1..0. .1..1..1..0..1..1
..1..1..0..1..0..1. .0..1..0..1..0..1. .1..0..0..0..1..1. .1..0..1..0..0..1
..0..0..1..0..1..0. .0..1..0..1..0..0. .1..0..1..0..0..1. .1..0..1..1..0..1
CROSSREFS
Cf. A302623.
Sequence in context: A172191 A304381 A281467 * A302413 A303180 A188820
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2018
STATUS
approved