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A227384 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order 1
6, 56, 587, 6160, 61127, 550010, 4450124, 32473856, 215116595, 1303420926, 7278846827, 37731073135, 182726436203, 831526393503, 3573916903775, 14573693121509, 56609147953260, 210199678971798, 748463901892529 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A227385

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..87

R. H. Hardin, Empirical polynomial of degree 39

FORMULA

Empirical polynomial of degree 39 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A092655 A099140 A048348 * A199755 A025749 A297705

Adjacent sequences:  A227381 A227382 A227383 * A227385 A227386 A227387

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 09 2013

STATUS

approved

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Last modified January 17 11:47 EST 2021. Contains 340240 sequences. (Running on oeis4.)