A238251 Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise

286, 2818, 43456, 523578, 6683137, 65450601, 640472606, 5080416791, 40066932588, 267891545518, 1781590953402, 10371478598345, 60084341166190, 311815187891138, 1610762741432521, 7583058204030841, 35540971632237331

Offset

1,1

Comments

Column 4 of A238255

Links

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

Example

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

Crossrefs

Sequence in context: A241616 A204035 A235409 * A027798 A072817 A117994

Adjacent sequences: A238248 A238249 A238250 * A238252 A238253 A238254

Keyword

nonn

Author

R. H. Hardin, Feb 21 2014

Status

approved