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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.)