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

16, 179, 2080, 23940, 256067, 2474769, 21404483, 166020522, 1163861138, 7445531291, 43876608955, 240208954149, 1230708580912, 5938337220753, 27130252386880, 117902658339547, 489326493663683, 1946146450518376

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