A204225 Number of (n+1)X4 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

2500, 44641, 752562, 8183170, 87487117, 694547816, 5466340007, 34834605810, 220710753856, 1196535903414, 6459574647599, 30967790434185, 148001428352179, 644776741493252, 2802681689033511, 11319015179680230, 45642521943090129

Offset

1,1

Comments

Column 3 of A204230

Links

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

Example

Some solutions for n=4
..0..0..2..0....2..1..0..0....0..0..2..0....1..1..2..0....2..1..0..2
..0..0..2..0....0..0..2..1....0..0..0..1....1..0..0..1....0..0..2..0
..0..1..1..1....1..2..2..1....1..0..2..1....0..2..1..1....1..2..0..2
..0..1..2..2....1..1..2..2....0..2..2..2....2..0..2..2....1..2..2..2
..1..0..2..1....2..2..2..1....0..1..2..1....1..2..1..1....2..2..1..2

Crossrefs

Sequence in context: A220025 A253377 A253370 * A251115 A235439 A235404

Adjacent sequences: A204222 A204223 A204224 * A204226 A204227 A204228

Keyword

nonn

Author

R. H. Hardin Jan 13 2012

Status

approved