A236424 Number of (n+1)X(2+1) 0..2 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.

487, 5772, 60193, 544380, 4505522, 34394854, 247470127, 1692391516, 11125768607, 70778574186, 438808934095, 2664649821781, 15926647839729, 94055397322922, 550759978627494, 3206878777142928, 18613731789595410, 107906959499841906

Offset

1,1

Comments

Column 2 of A236427

Links

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

Example

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

Crossrefs

Sequence in context: A048424 A142858 A255207 * A235839 A203873 A097766

Adjacent sequences: A236421 A236422 A236423 * A236425 A236426 A236427

Keyword

nonn

Author

R. H. Hardin, Jan 25 2014

Status

approved