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 A296321 Number of nXn 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1s. 0
 1, 3, 11, 61, 853, 20088, 850404, 72224019, 11207386103, 3245575984755, 1784744625714267, 1830394475306895557, 3517200566091635085954, 12698075318404649075573041, 85871949097296276009847589332 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A296327. LINKS EXAMPLE Some solutions for n=5 ..0..0..0..1..1. .0..0..0..0..0. .0..1..1..0..0. .0..0..0..1..1 ..0..0..1..0..1. .0..0..0..0..0. .1..0..1..0..0. .0..0..1..0..1 ..0..0..1..0..1. .0..1..1..0..0. .1..1..0..1..1. .0..0..1..1..0 ..0..1..0..0..1. .0..1..0..1..0. .0..0..0..1..0. .0..0..0..0..0 ..0..1..1..1..0. .0..0..1..1..0. .0..0..0..0..0. .0..0..0..0..0 CROSSREFS Cf. A296327. Sequence in context: A273468 A004108 A203007 * A203768 A069725 A291287 Adjacent sequences:  A296318 A296319 A296320 * A296322 A296323 A296324 KEYWORD nonn AUTHOR R. H. Hardin, Dec 10 2017 STATUS approved

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Last modified February 27 06:36 EST 2020. Contains 332299 sequences. (Running on oeis4.)