A205832 Number of (n+1)X5 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two

1611, 21126, 284910, 3875376, 52826862, 720376872, 9823579164, 133958429916, 1826692958490, 24909186485886, 339666855267840, 4631767319478810, 63159734164254090, 861259161426563160, 11744307584029537416

Offset

1,1

Comments

Column 4 of A205836

Links

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

Formula

Empirical: a(n) = 25*a(n-1) -206*a(n-2) +807*a(n-3) -1625*a(n-4) +1558*a(n-5) -399*a(n-6) -1818*a(n-7) +2122*a(n-8) -1092*a(n-9) +276*a(n-10) for n>11

Example

Some solutions for n=4
..2..2..1..0..2....1..2..1..0..0....1..0..1..2..2....1..0..2..2..1
..1..0..2..1..0....2..1..0..2..1....2..1..2..1..0....0..2..1..0..2
..2..1..0..2..1....0..2..1..0..2....0..2..0..2..1....1..0..2..1..0
..1..0..2..1..0....2..0..2..1..0....1..0..1..0..2....2..1..0..2..1
..2..1..0..2..1....0..1..0..2..1....2..1..2..1..0....0..2..1..0..2

Crossrefs

Sequence in context: A023685 A301938 A352545 * A317397 A236060 A231048

Adjacent sequences: A205829 A205830 A205831 * A205833 A205834 A205835

Keyword

nonn

Author

R. H. Hardin Feb 01 2012

Status

approved