A204481 Number of (n+2)X8 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order

24718, 29959, 9290, 11364, 11338, 18410, 47369, 133889, 481694, 1808046, 6765672, 25621498, 97131639, 368034455, 1395284106, 5289949408, 20055106670, 76034602906, 288269180957, 1092909631093, 4143534785206, 15709333424602

Offset

1,1

Comments

Column 6 of A204483

Links

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

Formula

Empirical: a(n) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13

Example

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

Crossrefs

Sequence in context: A189184 A321148 A216069 * A052356 A334024 A184093

Adjacent sequences: A204478 A204479 A204480 * A204482 A204483 A204484

Keyword

nonn

Author

R. H. Hardin Jan 15 2012

Status

approved