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 A208582 Number of 2Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
 2, 12, 152, 3024, 84124, 3057664, 139056380, 7675358704, 502604958608, 38359095933912, 3363791582993716, 334974400169588800, 37509570331200251508, 4683620100177290725336, 647429265450114057846496 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A208581 LINKS R. H. Hardin, Table of n, a(n) for n = 1..27 EXAMPLE Some solutions for n=4 ..0..0..0..0....0..0..1..0....0..0..1..1....0..0..0..1....0..0..0..0 ..1..1..2..0....1..2..0..1....1..2..0..0....1..1..0..2....1..1..1..0 CROSSREFS Sequence in context: A126777 A126345 A229558 * A000795 A085628 A177777 Adjacent sequences:  A208579 A208580 A208581 * A208583 A208584 A208585 KEYWORD nonn AUTHOR R. H. Hardin Feb 29 2012 STATUS approved

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Last modified December 6 20:22 EST 2021. Contains 349567 sequences. (Running on oeis4.)