A235423 Number of (3+1)X(n+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise

2304, 60231, 1607343, 33361964, 681329430, 11371435264, 191226875455, 2693722807642, 38797084056738, 475948685808390, 6010295272057196, 65600903066982746, 737945948050343658, 7275182009966196680

Offset

1,1

Comments

Row 3 of A235421

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A177759 A218431 A187292 * A235419 A229698 A236280

Adjacent sequences: A235420 A235421 A235422 * A235424 A235425 A235426

Keyword

nonn

Author

R. H. Hardin, Jan 10 2014

Status

approved