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 A281329 Number of 4 X n 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
 0, 304, 27144, 953236, 31906806, 977717308, 28739292730, 819460734096, 22863636278820, 627462391921784, 16998237537647454, 455708712521193672, 12112703985140255876, 319648041131418167054, 8383975282118464984646 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A281326. LINKS R. H. Hardin, Table of n, a(n) for n = 1..166 EXAMPLE Some solutions for n=3 ..0..1..0. .0..0..0. .0..0..1. .0..1..0. .0..1..1. .0..0..0. .0..1..1 ..0..1..2. .1..1..0. .1..2..1. .2..0..2. .2..2..0. .1..2..1. .0..0..0 ..2..2..1. .2..1..0. .1..1..2. .1..2..1. .0..0..0. .0..2..1. .0..2..0 ..1..2..1. .0..2..2. .1..2..0. .1..1..1. .2..2..1. .1..2..1. .1..2..0 CROSSREFS Cf. A281326. Sequence in context: A300922 A301530 A172228 * A293092 A221117 A216260 Adjacent sequences: A281326 A281327 A281328 * A281330 A281331 A281332 KEYWORD nonn AUTHOR R. H. Hardin, Jan 20 2017 STATUS approved

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Last modified March 26 04:47 EDT 2023. Contains 361529 sequences. (Running on oeis4.)