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A266432 Number of 6Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing. 1
7, 50, 433, 4383, 45907, 448649, 3889553, 29520031, 197001842, 1168481498, 6234449897, 30265682491, 135048855227, 558800630541, 2160517610564, 7856777499625, 27025799141430, 88367939113010, 275837411169430 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A266428.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 33

FORMULA

Empirical polynomial of degree 33 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A266428.

Sequence in context: A065429 A005460 A053155 * A267243 A197570 A319884

Adjacent sequences:  A266429 A266430 A266431 * A266433 A266434 A266435

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

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Last modified August 15 13:27 EDT 2020. Contains 336504 sequences. (Running on oeis4.)