A235409 Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise

286, 2302, 20398, 150862, 1155953, 7379380, 48788187, 273307984, 1578043496, 7881635316, 40377942968, 182401018359, 842470282449, 3486469196480, 14723645176175, 56437062063876, 220480959884552, 790014974680676

Offset

1,1

Comments

Column 4 of A235413

Links

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

Example

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

Crossrefs

Sequence in context: A253322 A241616 A204035 * A238251 A027798 A072817

Adjacent sequences: A235406 A235407 A235408 * A235410 A235411 A235412

Keyword

nonn

Author

R. H. Hardin, Jan 10 2014

Status

approved