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A204031 Number of (n+1)X(n+1) 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards 1
16, 164, 2928, 44366, 969528, 16895850, 397550036, 7576693894, 184631622106, 3777035543236, 93707916130348, 2028328695512904, 50826307266520194 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204039

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

..0..1..1..1..0....1..1..0..0..0....1..0..1..1..0....0..0..1..1..1

..1..0..0..0..1....0..0..1..1..1....0..1..0..1..1....0..1..0..1..1

..0..1..1..1..0....1..1..0..1..0....1..1..1..1..1....0..1..1..1..1

..0..1..0..1..1....0..1..1..1..1....1..1..1..1..1....0..1..1..1..1

..0..1..1..1..0....1..1..1..1..1....1..1..1..1..1....0..1..1..1..1

CROSSREFS

Sequence in context: A094857 A274801 A274747 * A341084 A025930 A125404

Adjacent sequences:  A204028 A204029 A204030 * A204032 A204033 A204034

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2012

STATUS

approved

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Last modified January 28 22:30 EST 2022. Contains 350669 sequences. (Running on oeis4.)