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A210053 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order 0
9, 646, 249327, 438056462, 3291534980629, 103709585657221609, 13640392041491409426441, 7487856028633349140449328134 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A210061

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

..0..2..0..1..0....2..2..0..0..0....0..0..0..2..2....2..0..3..0..0

..3..1..3..2..3....1..1..3..3..0....3..3..3..1..1....2..2..1..2..2

..2..0..2..2..2....2..2..0..3..0....1..1..3..1..1....3..2..1..1..2

..0..2..0..2..3....1..1..3..3..3....0..0..2..0..1....1..0..3..1..2

CROSSREFS

Sequence in context: A157597 A211611 A280904 * A128795 A191510 A081232

Adjacent sequences:  A210050 A210051 A210052 * A210054 A210055 A210056

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2012

STATUS

approved

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Last modified February 24 22:37 EST 2018. Contains 299627 sequences. (Running on oeis4.)