A207420 - OEIS

A207420

Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically

2, 16, 114, 1521, 55361, 3892729, 474552171, 116947584576, 59951676534906, 60921409199181129, 121441530119384020545, 483128923550195512221129, 3857404253001354057074186601, 61418617253685924322130029824769

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A207426

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

..1..0..1..1....1..1..1..0....1..0..0..1....0..0..1..1....0..1..1..0

..0..0..1..1....0..0..1..1....1..0..1..1....1..1..1..0....1..0..1..1

..1..0..1..1....0..1..1..1....0..0..1..1....1..1..0..0....1..0..0..1

..1..0..0..1....0..1..1..1....1..0..0..1....1..1..1..0....0..0..1..1

CROSSREFS

Sequence in context: A361743 A125725 A288965 * A207736 A208364 A207711

Adjacent sequences: A207417 A207418 A207419 * A207421 A207422 A207423

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 17 2012

STATUS

approved