A223630 - OEIS

A223630

Number of 6Xn 0..1 arrays with row sums nondecreasing and column sums unimodal

7, 247, 7504, 228401, 6555965, 180713080, 4777458798, 122344224851, 3041708958520, 73824736436005, 1754118644947248, 40935403480469124, 940380376523871886

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 6 of A223625

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A086214 A133589 A296377 * A203158 A227414 A203698

Adjacent sequences: A223627 A223628 A223629 * A223631 A223632 A223633

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved