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 A268964 Number of n X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 1
 3, 60, 2016, 136080, 18852912, 5712070032, 3870355944960, 5963413766987592, 21098726553552173712, 172587783760354579099176, 3279749300107885644432555744, 145303202175464965696103410891992 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A268971. LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for n=4 ..0..1..0..1. .1..0..0..1. .1..2..0..0. .2..1..2..2. .0..1..0..0 ..0..1..0..0. .1..0..2..1. .1..0..1..2. .2..1..2..1. .2..1..1..0 ..2..1..0..0. .1..2..2..1. .1..0..1..2. .2..2..2..1. .0..0..1..0 ..2..1..1..0. .2..2..2..2. .1..0..1..0. .1..1..2..1. .0..0..1..0 CROSSREFS Cf. A268971. Sequence in context: A219870 A326283 A259268 * A081854 A085990 A202065 Adjacent sequences:  A268961 A268962 A268963 * A268965 A268966 A268967 KEYWORD nonn AUTHOR R. H. Hardin, Feb 16 2016 STATUS approved

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Last modified August 9 15:33 EDT 2022. Contains 356026 sequences. (Running on oeis4.)