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 A278273 Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero. 1
 0, 2, 25, 1461, 350649, 329985827, 1158266740087, 15396080290130290, 772462850808202305809, 146439171275776627088638614, 104845555459822852114388229089230 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A278280. LINKS R. H. Hardin, Table of n, a(n) for n = 1..12 EXAMPLE Some solutions for n=4 ..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..0. .0..1..0..1 ..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..1. .0..1..0..1 ..1..1..1..0. .0..1..0..1. .0..1..1..0. .0..0..0..1. .1..0..0..0 ..1..0..0..1. .0..1..1..1. .1..0..1..1. .0..1..1..0. .0..1..1..0 CROSSREFS Cf. A278280. Sequence in context: A015214 A204234 A203747 * A210836 A088816 A323589 Adjacent sequences:  A278270 A278271 A278272 * A278274 A278275 A278276 KEYWORD nonn AUTHOR R. H. Hardin, Nov 16 2016 STATUS approved

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Last modified January 22 23:09 EST 2021. Contains 340383 sequences. (Running on oeis4.)