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 A281393 Number of n X n 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 0
 0, 0, 131, 1020, 5892, 23216, 84474, 285076, 886900, 2652496, 7689224, 21516104, 58884471 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A281400. LINKS Table of n, a(n) for n=1..13. EXAMPLE Some solutions for n=4 ..0..0..0..1. .0..0..1..1. .0..0..1..0. .0..1..0..0. .0..1..1..0 ..1..0..1..1. .1..1..0..0. .0..1..1..1. .1..1..1..0. .1..0..0..1 ..1..0..1..0. .0..1..0..1. .0..1..0..0. .0..0..1..0. .0..1..0..1 ..0..1..0..0. .0..0..0..1. .0..1..0..1. .0..1..1..0. .0..1..0..0 CROSSREFS Cf. A281400. Sequence in context: A142205 A142807 A103834 * A169645 A221154 A144247 Adjacent sequences: A281390 A281391 A281392 * A281394 A281395 A281396 KEYWORD nonn AUTHOR R. H. Hardin, Jan 21 2017 STATUS approved

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Last modified September 23 03:48 EDT 2023. Contains 365532 sequences. (Running on oeis4.)