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 A208468 Number of 3Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 0
 5, 203, 20746, 4132120, 1358524513, 671329819215, 468215145028629, 440379520700561467, 539586833002472556426, 838156377510207185078132, 1614568986664304552415637091, 3787532565162728522045725351515 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A208466 LINKS EXAMPLE Some solutions for n=4 ..0..0..0..0....0..1..2..0....0..0..0..0....0..0..0..0....0..1..0..1 ..0..1..0..0....0..1..0..0....0..1..1..0....0..1..2..0....0..0..0..0 ..1..0..1..0....0..0..1..0....0..1..0..2....1..0..0..0....1..1..1..0 CROSSREFS Sequence in context: A197044 A216615 A215923 * A070906 A208052 A137736 Adjacent sequences: A208465 A208466 A208467 * A208469 A208470 A208471 KEYWORD nonn AUTHOR R. H. Hardin Feb 27 2012 STATUS approved

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Last modified March 20 17:37 EDT 2023. Contains 361391 sequences. (Running on oeis4.)