A235557 Number of (n+1)X(2+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise

2612, 86742, 2481481, 58495571, 1190247008, 21374536916, 348532234129, 5242478364024, 73916754634539, 986934451901485, 12602732098597039, 154990682101091470, 1848012177784521785, 21472048623026034484

Offset

1,1

Comments

Column 2 of A235559

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A236666 A252341 A235777 * A257427 A257420 A254236

Adjacent sequences: A235554 A235555 A235556 * A235558 A235559 A235560

Keyword

nonn

Author

R. H. Hardin, Jan 12 2014

Status

approved