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A230969 Number of (n+2)X(n+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 0
0, 144, 13872, 6170256, 11094079744, 66985909298064, 1388708377137781120, 101290675055736816040000, 25961188014463809661357637024, 23330456050837373777439681163833600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A230977

LINKS

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

EXAMPLE

Some solutions for n=2

..0..2..0..2....0..3..0..3....0..1..0..1....0..1..0..3....0..3..0..1

..1..1..3..3....2..1..0..3....2..1..2..3....2..1..0..3....0..1..2..1

..2..0..0..2....0..1..2..3....2..3..0..1....2..3..0..3....0..1..2..1

..3..3..1..3....0..3..0..1....2..3..0..3....2..3..2..3....0..3..0..1

CROSSREFS

Sequence in context: A182913 A231697 A238932 * A252779 A238284 A249181

Adjacent sequences:  A230966 A230967 A230968 * A230970 A230971 A230972

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 02 2013

STATUS

approved

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Last modified June 27 12:48 EDT 2022. Contains 354896 sequences. (Running on oeis4.)