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A203445 Number of (n+1)X(n+1) 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing 0
8, 34, 321, 7481, 554620, 125140148, 91479447926, 216607480473481, 1675743278510590472, 42706348945332757503203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A203452

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A229398 A223015 A222796 * A318244 A280395 A158991

Adjacent sequences:  A203442 A203443 A203444 * A203446 A203447 A203448

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified June 29 23:00 EDT 2022. Contains 354913 sequences. (Running on oeis4.)