A229373 Number of n X n 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.

3, 30, 956, 78690, 20014278, 13999334726, 29757371834046, 174511010613631514, 3123774881474924676470, 153541601581149110702908096, 23150533101205838897343355257558, 9547382122506738591063952302014235288

Offset

1,1

Comments

Diagonal of A229380.

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=4
..1..0..1..0....2..0..0..2....2..0..2..1....1..2..2..1....1..2..1..2
..1..0..1..0....1..2..2..1....1..0..1..2....2..0..1..0....0..0..0..0
..2..0..1..2....1..0..1..2....1..0..1..0....1..0..2..0....2..1..2..1
..1..2..2..1....1..2..1..0....2..0..1..2....1..0..1..2....0..0..0..2

Crossrefs

Cf. A229380.

Sequence in context: A174549 A363426 A184575 * A355400 A203469 A296590

Adjacent sequences: A229370 A229371 A229372 * A229374 A229375 A229376

Keyword

nonn

Author

R. H. Hardin Sep 21 2013

Status

approved