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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
1, 3, 30, 596, 22988, 1774372, 273764292, 85071335388, 53278240463204, 67444355089828632, 172664716787589924632, 895256317336401964070392, 9404595196718819502562934668, 200324135427294084369446897344852
OFFSET
1,2
COMMENTS
Diagonal of A274803.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2016
STATUS
approved