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A274722 Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2), (-2,-1) or (-1,0) and new values introduced in order 0..2. 0
1, 6, 68, 1632, 84948, 8960464, 1980677448, 905233056800, 860544738080372, 1705630286322728068 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A274728.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..0..0..1..0. .0..1..0..1. .0..1..1..1. .0..1..0..1. .0..1..2..0

..2..1..2..2. .1..0..1..2. .1..0..2..0. .2..0..2..2. .1..0..1..2

..1..2..1..0. .0..2..0..1. .2..1..0..2. .1..1..0..1. .2..1..0..1

..0..0..0..1. .2..0..2..0. .0..0..1..0. .0..0..2..0. .1..0..1..2

CROSSREFS

Cf. A274728.

Sequence in context: A349557 A140606 A014505 * A347927 A127184 A333795

Adjacent sequences:  A274719 A274720 A274721 * A274723 A274724 A274725

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 03 2016

STATUS

approved

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Last modified January 19 06:18 EST 2022. Contains 350464 sequences. (Running on oeis4.)