A183693 Number of (n+1)X5 0..2 arrays with every 2X2 subblock nonsingular

12362, 969978, 75166498, 5848268518, 454422625582, 35325040673626, 2745624826054514, 213413389362873662, 16588019956268604926, 1289347795300644331026, 100217757971785737168402

Offset

1,1

Comments

Column 4 of A183698

Links

R. H. Hardin, Table of n, a(n) for n = 1..157

Formula

Empirical: a(n)=40*a(n-1)+3314*a(n-2)-10714*a(n-3)-1591695*a(n-4)+5974533*a(n-5)+283908660*a(n-6)-1911994230*a(n-7)-15930513416*a(n-8)+178719705971*a(n-9)-192907598766*a(n-10)-2682038440672*a(n-11)+6467234810528*a(n-12)+14403476148048*a(n-13)-42735625715392*a(n-14)-34526954247616*a(n-15)+97954297842688*a(n-16)+34981712707072*a(n-17)-68662768934912*a(n-18)-15576419467264*a(n-19)

Example

Some solutions for 3X5
..0..2..0..2..1....0..1..0..1..1....0..1..2..1..0....0..1..2..1..2
..2..0..1..2..0....2..1..2..0..2....2..2..0..1..2....1..2..0..1..1
..0..2..2..2..2....2..2..2..2..2....2..0..2..0..1....2..2..2..1..2

Crossrefs

Sequence in context: A045080 A238051 A234919 * A096618 A238308 A179916

Adjacent sequences: A183690 A183691 A183692 * A183694 A183695 A183696

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved