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 A269090 Number of n X n 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once. 1
 0, 96, 31296, 37963968, 211625837280, 5826856525990272, 819944297332124826720, 600994567853371717147309536, 2321584677123190401202986846749664, 47631920426007575412576023256743509016160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A269097. LINKS R. H. Hardin, Table of n, a(n) for n = 1..11 EXAMPLE Some solutions for n=3 ..2..1..1. .1..3..2. .2..3..3. .2..3..3. .0..0..0. .2..0..1. .3..3..2 ..0..1..0. .3..3..3. .3..3..1. .0..1..1. .1..0..2. .3..2..2. .2..3..2 ..0..1..1. .1..2..2. .2..2..2. .1..0..3. .1..2..3. .3..3..3. .1..3..2 CROSSREFS Cf. A269097. Sequence in context: A208794 A276099 A233161 * A232522 A296061 A340396 Adjacent sequences: A269087 A269088 A269089 * A269091 A269092 A269093 KEYWORD nonn AUTHOR R. H. Hardin, Feb 19 2016 STATUS approved

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Last modified September 17 04:45 EDT 2024. Contains 375985 sequences. (Running on oeis4.)