A251345 Number of (n+1)X(2+1) 0..2 arrays with every 2X2 subblock summing to 3 4 or 5

309, 3921, 50831, 663307, 8671957, 113445117, 1484345363, 19422725739, 254151937033, 3325670716433, 43517693556387, 569446264259255, 7451431382751933, 97504955911036833, 1275891317091048423

Offset

1,1

Comments

Column 2 of A251351

Links

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

Formula

Empirical: a(n) = 16*a(n-1) -27*a(n-2) -173*a(n-3) +362*a(n-4) -61*a(n-5) -144*a(n-6) +48*a(n-7)

Example

Some solutions for n=3
..2..1..2....2..0..2....1..0..1....0..2..1....1..2..1....0..1..0....1..0..2
..0..1..0....1..2..0....1..1..1....0..2..0....1..1..0....1..1..1....2..0..1
..2..1..1....1..0..1....0..1..1....2..1..0....2..1..1....1..2..1....2..1..1
..2..0..1....1..1..2....0..2..1....1..1..1....2..0..1....1..0..2....0..0..1

Crossrefs

Sequence in context: A067730 A183627 A184544 * A105841 A127456 A114484

Adjacent sequences: A251342 A251343 A251344 * A251346 A251347 A251348

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved