A204373 Number of (n+2)X(n+2) 0..1 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..1 introduced in row major order

33, 48, 61, 87, 136, 217, 347, 560, 901, 1455, 2352, 3801, 6147, 9944, 16085, 26023, 42104, 68121, 110219, 178336, 288549, 466879, 755424, 1222297, 1977715

Offset

1,1

Comments

Diagonal of A204381

Links

Table of n, a(n) for n=1..25.

Example

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

Crossrefs

Sequence in context: A179244 A258698 A258697 * A111502 A080933 A328247

Adjacent sequences: A204370 A204371 A204372 * A204374 A204375 A204376

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved