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A227557 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having nonzero determinant, with rows and columns of the latter in lexicographically nondecreasing order 1
16, 179, 2080, 23940, 256067, 2474769, 21404483, 166020522, 1163861138, 7445531291, 43876608955, 240208954149, 1230708580912, 5938337220753, 27130252386880, 117902658339547, 489326493663683, 1946146450518376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A227558

LINKS

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

R. H. Hardin, Empirical polynomial of degree 47

FORMULA

Empirical polynomial of degree 47 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A255255 A181239 A021084 * A269202 A269103 A016305

Adjacent sequences:  A227554 A227555 A227556 * A227558 A227559 A227560

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 16 2013

STATUS

approved

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Last modified October 20 04:52 EDT 2021. Contains 348099 sequences. (Running on oeis4.)