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A204225 Number of (n+1)X4 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards 2
2500, 44641, 752562, 8183170, 87487117, 694547816, 5466340007, 34834605810, 220710753856, 1196535903414, 6459574647599, 30967790434185, 148001428352179, 644776741493252, 2802681689033511, 11319015179680230, 45642521943090129 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 18 20:34 EDT 2019. Contains 327181 sequences. (Running on oeis4.)