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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A284334. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 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 Adjacent sequences: A284332 A284333 A284334 * A284336 A284337 A284338 KEYWORD nonn AUTHOR R. H. Hardin, Mar 25 2017 STATUS approved

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Last modified February 3 15:47 EST 2023. Contains 360035 sequences. (Running on oeis4.)