A204795 Number of (n+1)X4 0..1 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing

125, 1001, 6537, 42214, 270148, 1729515, 11096511, 71369791, 459554519, 2960897995, 19082285695, 122998524851, 792865245671, 5111098107899, 32948570941935, 212404040448451, 1369275577457015, 8827137858045451

Offset

1,1

Comments

Column 3 of A204800

Links

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

Formula

Empirical: a(n) = 10*a(n-1) -17*a(n-2) -64*a(n-3) +168*a(n-4) +32*a(n-5) -256*a(n-6) +64*a(n-7) +64*a(n-8) for n>15

Example

Some solutions for n=4
..1..0..0..0....1..1..1..0....1..1..0..0....0..1..1..1....1..1..1..1
..1..0..0..1....0..0..0..0....1..0..0..0....1..1..0..1....0..0..0..0
..0..0..0..1....0..1..1..1....0..0..0..1....1..0..0..1....1..1..1..0
..1..0..0..0....0..0..0..0....0..1..0..0....0..0..0..0....1..1..1..1
..0..0..0..1....1..0..1..1....0..1..0..1....1..1..1..1....0..0..0..1

Crossrefs

Sequence in context: A355885 A088896 A016851 * A352161 A243240 A237713

Adjacent sequences: A204792 A204793 A204794 * A204796 A204797 A204798

Keyword

nonn

Author

R. H. Hardin Jan 19 2012

Status

approved