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 A300420 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
 0, 3, 53, 2227, 240196, 67378450, 48707694395, 90693182026546, 435112536711313866, 5381527099060030118335, 171582103150798864303410622 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A300427. LINKS EXAMPLE Some solutions for n=5 ..0..0..0..0..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..1..1 ..0..1..0..1..1. .1..0..1..0..0. .0..1..0..1..0. .1..1..0..0..0 ..0..1..0..1..0. .1..0..1..1..0. .0..1..0..1..0. .0..1..1..0..1 ..0..1..0..0..0. .0..0..1..0..0. .1..1..0..0..1. .0..0..1..0..1 ..1..1..1..1..0. .1..1..0..1..1. .0..0..1..1..1. .0..0..1..1..1 CROSSREFS Cf. A300427. Sequence in context: A012823 A098932 A100444 * A300683 A296678 A227051 Adjacent sequences:  A300417 A300418 A300419 * A300421 A300422 A300423 KEYWORD nonn AUTHOR R. H. Hardin, Mar 05 2018 STATUS approved

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Last modified January 26 07:04 EST 2022. Contains 350572 sequences. (Running on oeis4.)