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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
1, 8, 33, 265, 3716, 85681, 3162172, 193490711, 19420814056, 3186206928387, 862553899224504, 384159816761460081, 280924309017824796979, 338777671702533919423933, 672692693382038110389392230
OFFSET
1,2
COMMENTS
Diagonal of A204197.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2012
STATUS
approved