A226869 Number of n X 5 (-1,0,1) arrays of determinants of 2 X 2 subblocks of some (n+1) X 6 binary array with rows and columns of the latter in lexicographically nondecreasing order.

16, 199, 2866, 41222, 523701, 5692900, 53537470, 442630782, 3265819433, 21794415254, 133089115844, 750997324318, 3948233068168, 19473426565401, 90637200115088, 400104222792110, 1682355624069512, 6763445214323202

Offset

1,1

Comments

Column 5 of A226870.

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..0....0..0..0..0.-1....0..0..0.-1..0....0..0..0.-1..1
..0..0..0..0.-1....0..0.-1..1..1....0.-1..1.-1..1....0.-1..0..1.-1
..0..0.-1..1.-1....0.-1..0..0.-1...-1..0..0..0..0...-1..0..1..0.-1
..0..0..0..0..0...-1..1..1.-1..1....0..0..0..0.-1....1..0.-1.-1..0

Crossrefs

Cf. A226870.

Sequence in context: A154240 A081679 A154249 * A257289 A125451 A154348

Adjacent sequences: A226866 A226867 A226868 * A226870 A226871 A226872

Keyword

nonn

Author

R. H. Hardin, Jun 20 2013

Status

approved