A204613 Number of (n+1) X 6 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.

907, 14199, 205117, 3084029, 45645661, 681254361, 10133992449, 150976448169, 2247899446625, 33478224206409, 498544006062097, 7424476991609881, 110565854451215521, 1646569684719609385, 24520996268226201073

Offset

1,1

Comments

Column 5 of A204616.

Links

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

Formula

Empirical: a(n) = 36*a(n-1) -406*a(n-2) +404*a(n-3) +23747*a(n-4) -145816*a(n-5) -129968*a(n-6) +3736568*a(n-7) -7902612*a(n-8) -29701104*a(n-9) +128249776*a(n-10) +34934976*a(n-11) -780114560*a(n-12) +607369728*a(n-13) +2210927104*a(n-14) -3052507136*a(n-15) -2863537152*a(n-16) +5709414400*a(n-17) +1514283008*a(n-18) -4781309952*a(n-19) -281149440*a(n-20) +1658847232*a(n-21) +94371840*a(n-22) -150994944*a(n-23) for n>26.

Example

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

Crossrefs

Cf. A204616.

Sequence in context: A177998 A253347 A253354 * A204797 A303887 A305280

Adjacent sequences: A204610 A204611 A204612 * A204614 A204615 A204616

Keyword

nonn

Author

R. H. Hardin, Jan 17 2012

Status

approved