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A284335
Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
1
2, 4, 13, 34, 118, 419, 1481, 5394, 19848, 73880, 277222, 1047495, 3977615, 15169751, 58074521, 223081286, 859450114, 3319751314, 12852496680, 49860496892, 193783946748, 754379484650, 2941051327294, 11481400024511, 44875877924939
OFFSET
1,1
COMMENTS
Row 2 of A284334.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..1..0. .0..1..1..0. .0..0..0..0. .0..0..1..0. .0..0..1..1
..0..1..0..1. .0..1..1..0. .1..1..1..1. .1..1..1..0. .0..1..0..1
CROSSREFS
Cf. A284334.
Sequence in context: A148232 A148233 A148234 * A192443 A189590 A189597
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 25 2017
STATUS
approved