A205409 Number of (n+2)X4 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order

3868, 44596, 549414, 5686031, 64878898, 768581101, 8606465750, 98080551694, 1133347809296, 12914400827409, 147488385577992, 1691863713691698, 19345357758536500, 221200783159493283, 2532531552219620474

Offset

1,1

Comments

Column 2 of A205415

Links

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

Example

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

Crossrefs

Sequence in context: A220752 A257780 A068267 * A103117 A204791 A204784

Adjacent sequences: A205406 A205407 A205408 * A205410 A205411 A205412

Keyword

nonn

Author

R. H. Hardin Jan 26 2012

Status

approved