A184787 Number of (n+2)X3 0..2 arrays with each 3X3 subblock singular

6891, 100941, 1451439, 19143309, 264517911, 3635551053, 49631761863, 680594596269, 9325198131783, 127707459851229, 1749659420599239, 23968756658981133, 328340087728123527, 4497988332883770237

Offset

1,1

Comments

Column 1 of A184791

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=23*a(n-1)-133*a(n-2)+359*a(n-3)-6981*a(n-4)+44653*a(n-5)-46861*a(n-6)+510397*a(n-7)-3119750*a(n-8)-4266752*a(n-9)-7337146*a(n-10)+97617840*a(n-11)+421337240*a(n-12)+194265216*a(n-13)-2452885280*a(n-14)-11665215256*a(n-15)-13514300128*a(n-16)+36492062528*a(n-17)+161174571904*a(n-18)+234355030272*a(n-19)-208323990528*a(n-20)-1253913449472*a(n-21)-1586195787776*a(n-22)+535347175424*a(n-23)+4616948760576*a(n-24)+4932168384512*a(n-25)-1803615731712*a(n-26)-6148702863360*a(n-27)-2853804441600*a(n-28)

Example

Some solutions for 4X3
..1..1..1....0..0..2....1..0..2....1..0..2....1..0..1....2..1..2....2..2..2
..1..0..1....1..0..0....2..0..1....2..2..0....2..0..0....0..1..2....1..1..0
..2..0..2....2..0..0....0..0..0....1..1..0....2..0..0....0..1..2....0..0..0
..1..2..0....2..0..2....2..1..1....0..2..1....1..2..2....1..0..1....0..2..1

Crossrefs

Sequence in context: A031581 A031761 A184791 * A233180 A233262 A233245

Adjacent sequences: A184784 A184785 A184786 * A184788 A184789 A184790

Keyword

nonn

Author

R. H. Hardin Jan 22 2011

Status

approved