A205469 Number of (n+1)X3 0..2 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..2 introduced in row major order

48, 263, 1548, 9654, 61978, 405702, 2686876, 17926060, 120146998, 807610262, 5438698312, 36669657896, 247432193154, 1670424338586, 11280890946852, 76200323465372, 514795456961870, 3478208969481038, 23502035785763264

Offset

1,1

Comments

Column 2 of A205475

Links

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

Formula

Empirical: a(n) = 16*a(n-1) -85*a(n-2) +142*a(n-3) +159*a(n-4) -676*a(n-5) +465*a(n-6) +298*a(n-7) -506*a(n-8) +220*a(n-9) -32*a(n-10)

Example

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

Crossrefs

Sequence in context: A235911 A235904 A275406 * A115056 A001337 A259993

Adjacent sequences: A205466 A205467 A205468 * A205470 A205471 A205472

Keyword

nonn

Author

R. H. Hardin Jan 27 2012

Status

approved