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A251327 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock summing to 2 4 or 6 0
39, 1115, 75391, 13857083, 8130801167, 16682303832387, 119455642968747047, 2906457494360881156619, 236005702652830583741374855, 63305022966063301195370267957275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251335

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..0..0..0..0....0..2..0..2....0..0..0..2....0..2..0..0....2..2..2..2

..2..2..2..2....2..0..2..2....2..2..0..2....2..0..2..2....0..2..0..2

..2..0..0..0....2..0..2..0....2..0..0..0....2..2..0..0....0..2..0..2

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

CROSSREFS

Sequence in context: A028227 A028219 A209076 * A014936 A227524 A240442

Adjacent sequences:  A251324 A251325 A251326 * A251328 A251329 A251330

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified April 18 10:51 EDT 2019. Contains 322209 sequences. (Running on oeis4.)