A204634 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order

124, 1884, 248, 478, 3300, 5446, 16636, 76664, 227352, 826274, 3255608

Offset

1,1

Comments

Diagonal of A204642

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A251374 A209730 A185860 * A327339 A024017 A260097

Adjacent sequences: A204631 A204632 A204633 * A204635 A204636 A204637

Keyword

nonn

Author

R. H. Hardin Jan 17 2012

Status

approved