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 A281399 Number of nX7 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. 1
 0, 1296, 2364, 6276, 16241, 37462, 84474, 185834, 400854, 871302, 1899789, 4111556, 8868230, 19130914, 41172419, 88375862, 189462087, 405538634, 866448924, 1848700340, 3939571575, 8383924848, 17820831178, 37839585622, 80261619670 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 7 of A281400. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 3*a(n-1) -a(n-2) +5*a(n-3) -15*a(n-4) -7*a(n-5) +26*a(n-7) +34*a(n-8) -8*a(n-9) -16*a(n-10) -40*a(n-11) -16*a(n-12) -26*a(n-13) +5*a(n-14) +59*a(n-15) +33*a(n-16) +3*a(n-17) -18*a(n-18) -2*a(n-19) -15*a(n-20) -21*a(n-21) +9*a(n-22) +9*a(n-23) for n>38 EXAMPLE Some solutions for n=4 ..0..1..0..0..1..0..1. .0..0..1..0..1..0..1. .0..1..0..0..1..1..0 ..0..1..1..0..1..0..1. .1..0..1..0..0..0..1. .0..1..1..0..1..0..0 ..0..1..0..0..1..0..0. .0..0..1..0..1..0..1. .0..0..1..0..1..0..1 ..1..1..0..1..1..1..0. .0..1..1..0..1..0..1. .1..0..1..1..1..0..1 CROSSREFS Cf. A281400. Sequence in context: A273631 A186486 A186485 * A043372 A372841 A217908 Adjacent sequences: A281396 A281397 A281398 * A281400 A281401 A281402 KEYWORD nonn AUTHOR R. H. Hardin, Jan 21 2017 STATUS approved

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Last modified May 26 04:31 EDT 2024. Contains 372807 sequences. (Running on oeis4.)