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A301827
Number of 6Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
0, 89, 32, 457, 4785, 31061, 333335, 2626219, 23877827, 205351902, 1801313687, 15687547616, 136936362641, 1194708417693, 10425856252982, 90962890652095, 793785856101375, 6926025279583683, 60436457205654289, 527344354745821834
OFFSET
1,2
COMMENTS
Row 6 of A301823.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1
..0..1..1..0..0. .0..0..0..0..0. .0..1..0..1..0. .0..1..0..1..1
..0..0..1..1..0. .1..1..1..1..1. .1..0..1..0..0. .1..0..0..1..1
..0..1..1..0..1. .0..0..0..0..0. .0..0..1..1..1. .1..1..0..0..1
..0..0..0..1..0. .1..1..1..0..0. .0..0..0..0..0. .1..1..0..1..1
..1..1..1..0..0. .0..0..1..1..1. .1..1..1..1..1. .1..1..0..0..0
CROSSREFS
Cf. A301823.
Sequence in context: A187812 A075483 A220135 * A262093 A033409 A152160
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 27 2018
STATUS
approved