A238250 Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise

121, 804, 6828, 43456, 284992, 1473792, 7616082, 32986844, 142361644, 537301496, 2020791427, 6843417893, 23099713493, 71683038307, 221767602558, 640525984280, 1844757869502, 5018918602972, 13619020527533, 35234899933725

Offset

1,1

Comments

Column 3 of A238255

Links

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

R. H. Hardin, Empirical recurrence of order 81

Formula

Empirical recurrence of order 81 (see link above)

Example

Some solutions for n=4
..0..0..0..1....0..1..1..1....0..0..0..1....0..0..0..1....0..0..0..0
..0..0..0..0....0..0..1..1....1..0..1..0....0..0..0..0....0..0..0..0
..0..1..0..0....1..1..0..0....0..0..0..1....0..0..0..1....1..0..1..0
..0..1..1..1....0..1..1..1....1..1..1..0....1..0..1..0....1..1..1..1
..1..1..1..1....1..1..0..1....1..1..1..0....1..0..1..1....1..0..1..0

Crossrefs

Sequence in context: A293507 A356630 A306452 * A361658 A293588 A365969

Adjacent sequences: A238247 A238248 A238249 * A238251 A238252 A238253

Keyword

nonn

Author

R. H. Hardin, Feb 21 2014

Status

approved