A204191 Number of n X n 0..1 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order.

1, 8, 33, 265, 3716, 85681, 3162172, 193490711, 19420814056, 3186206928387, 862553899224504, 384159816761460081, 280924309017824796979, 338777671702533919423933, 672692693382038110389392230

Offset

1,2

Comments

Diagonal of A204197.

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=5
..0..0..1..1..0....0..0..1..0..0....0..0..1..1..0....0..0..1..0..0
..1..1..0..0..1....0..1..0..0..1....0..1..1..0..1....1..1..0..1..1
..0..0..1..1..0....1..1..0..1..1....1..1..0..1..1....1..0..1..1..0
..0..1..1..0..0....1..0..1..0..0....1..0..1..1..0....0..0..1..0..1
..1..1..0..1..1....0..0..1..0..1....0..0..1..0..0....0..1..0..1..1

Crossrefs

Sequence in context: A005398 A240044 A069509 * A041118 A308879 A297904

Adjacent sequences: A204188 A204189 A204190 * A204192 A204193 A204194

Keyword

nonn

Author

R. H. Hardin, Jan 12 2012

Status

approved