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 A300683 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
 0, 3, 53, 2229, 240463, 67479838, 48809162176, 90926518437773, 436444614204907032, 5400843845781866915026, 172295115662202424268978762 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A300689. LINKS Table of n, a(n) for n=1..11. EXAMPLE Some solutions for n=5 ..0..0..0..0..1. .0..0..0..0..1. .0..0..0..0..1. .0..0..0..0..0 ..0..1..1..1..1. .0..1..0..1..1. .0..1..1..0..1. .0..1..1..0..1 ..1..0..0..0..1. .1..0..1..0..0. .0..0..1..1..0. .1..0..1..0..1 ..1..1..1..1..0. .0..1..0..1..0. .1..0..0..1..0. .0..1..0..1..0 ..0..0..0..0..0. .1..1..1..1..0. .1..1..0..0..0. .0..0..1..1..0 CROSSREFS Cf. A300689. Sequence in context: A098932 A100444 A300420 * A296678 A227051 A300606 Adjacent sequences: A300680 A300681 A300682 * A300684 A300685 A300686 KEYWORD nonn AUTHOR R. H. Hardin, Mar 11 2018 STATUS approved

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Last modified April 22 10:51 EDT 2024. Contains 371897 sequences. (Running on oeis4.)