A235839 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 rowwise and columnwise.

487, 6921, 86509, 919222, 8638740, 73276865, 573836909, 4209526173, 29315012106, 195567636675, 1260793028680, 7902333022413, 48450753346164, 291857672487975, 1735081638204069, 10213231916866375, 59720608313178454, 347726532976693642

Offset

1,1

Comments

Column 2 of A235842

Links

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

Example

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

Crossrefs

Sequence in context: A142858 A255207 A236424 * A203873 A097766 A214806

Adjacent sequences: A235836 A235837 A235838 * A235840 A235841 A235842

Keyword

nonn

Author

R. H. Hardin, Jan 16 2014

Status

approved