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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
OFFSET
1,1
COMMENTS
Column 5 of A227558
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 16 2013
STATUS
approved