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 A269220 Number of 7Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once. 1
 0, 7375872, 2039727744, 599456856000, 163535201141376, 43468685827935816, 11273191243423937904, 2872961996154823592256, 722010748558146090563664, 179436639887553691981747008, 44187481124719769649267286128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 7 of A269214. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some solutions for n=2 ..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0 ..0..2. .0..0. .0..0. .0..0. .0..0. .0..2. .0..0. .0..0. .0..2. .0..0 ..2..0. .0..1. .1..0. .1..0. .0..0. .0..2. .1..1. .1..1. .0..0. .1..3 ..2..3. .3..3. .1..1. .2..3. .2..2. .2..2. .2..3. .0..1. .0..0. .3..1 ..1..1. .2..2. .1..3. .0..2. .3..3. .3..2. .2..2. .3..2. .1..3. .3..1 ..3..1. .2..3. .3..2. .3..2. .2..1. .0..3. .2..0. .1..3. .1..1. .3..2 ..3..2. .3..3. .3..2. .3..3. .0..0. .2..2. .1..3. .1..3. .0..0. .0..1 CROSSREFS Cf. A269214. Sequence in context: A116259 A158256 A306873 * A268406 A302135 A104921 Adjacent sequences:  A269217 A269218 A269219 * A269221 A269222 A269223 KEYWORD nonn AUTHOR R. H. Hardin, Feb 20 2016 STATUS approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)