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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 13 2012
STATUS
approved

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Last modified February 25 17:36 EST 2024. Contains 370332 sequences. (Running on oeis4.)