A274797 Number of n X n 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, 3, 30, 596, 22988, 1774372, 273764292, 85071335388, 53278240463204, 67444355089828632, 172664716787589924632, 895256317336401964070392, 9404595196718819502562934668, 200324135427294084369446897344852

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