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, 144, 13872, 6170256, 11094079744, 66985909298064, 1388708377137781120, 101290675055736816040000, 25961188014463809661357637024, 23330456050837373777439681163833600

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