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 A274797 Number of nXn 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2. 1
 1, 3, 30, 596, 22988, 1774372, 273764292, 85071335388, 53278240463204, 67444355089828632, 172664716787589924632, 895256317336401964070392, 9404595196718819502562934668, 200324135427294084369446897344852 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A274803. LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for n=4 ..0..1..2..1. .0..1..0..1. .0..1..0..1. .0..1..2..1. .0..1..2..0 ..1..0..1..2. .1..2..1..0. .1..0..2..0. .1..0..1..0. .1..2..1..2 ..2..1..0..1. .2..1..2..1. .0..2..0..1. .0..1..0..1. .2..1..2..1 ..1..0..1..0. .1..0..1..0. .1..0..1..0. .1..2..1..0. .1..2..0..2 CROSSREFS Cf. A274803. Sequence in context: A319940 A177449 A184900 * A092677 A007019 A327021 Adjacent sequences:  A274794 A274795 A274796 * A274798 A274799 A274800 KEYWORD nonn AUTHOR R. H. Hardin, Jul 07 2016 STATUS approved

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Last modified February 18 04:48 EST 2020. Contains 332011 sequences. (Running on oeis4.)