A235422 Number of (2+1)X(n+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise

432, 5022, 60879, 543946, 4895505, 35230388, 255103234, 1554228232, 9515328218, 50741400195, 271565143251, 1297890540438, 6219668001557, 27116924880173, 118466428248793, 477662770905341, 1929017445264100, 7271629530089986

Offset

1,1

Comments

Row 2 of A235421

Links

R. H. Hardin, Table of n, a(n) for n = 1..33

Example

Some solutions for n=3
..0..1..0..2....2..1..1..0....1..1..0..0....0..1..1..0....0..0..1..0
..2..2..2..0....2..2..2..1....1..1..1..0....2..0..1..1....2..2..1..1
..1..2..1..2....1..2..2..1....2..2..1..1....1..2..1..1....2..1..2..2

Crossrefs

Sequence in context: A234327 A174717 A235418 * A234405 A234400 A236279

Adjacent sequences: A235419 A235420 A235421 * A235423 A235424 A235425

Keyword

nonn

Author

R. H. Hardin, Jan 10 2014

Status

approved