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A184687 1/3 the number of n X n 0..2 arrays with no element equal both to the element above and to the element to its left 1
1, 24, 4080, 4890528, 41325395328, 2461751303097216, 1033802803683039013248, 3060537246479645213149335744, 63873994081842807211176279381955968, 9397599222467284962086636818784583099209472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A184694

LINKS

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

EXAMPLE

Some solutions for 3X3 with a(1,1)=0

..0..0..1....0..0..1....0..2..1....0..1..1....0..1..2....0..0..0....0..2..0

..1..0..0....0..1..0....2..1..0....2..1..2....0..2..1....2..2..1....0..2..0

..0..2..0....2..2..2....0..2..0....0..1..0....1..1..2....1..0..2....0..1..0

CROSSREFS

Sequence in context: A166768 A326120 A159399 * A007241 A106207 A100089

Adjacent sequences:  A184684 A184685 A184686 * A184688 A184689 A184690

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 20 2011

STATUS

approved

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Last modified September 19 15:08 EDT 2019. Contains 327198 sequences. (Running on oeis4.)