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A204564 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 0
8, 482, 158981, 226207388, 1331721926667, 32661078401030941, 3362962064457744565685, 1461449454372060333546626590 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204572

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A054326 A203526 A210117 * A152495 A197096 A332148

Adjacent sequences: A204561 A204562 A204563 * A204565 A204566 A204567

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2012

STATUS

approved

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Last modified January 31 11:56 EST 2023. Contains 359971 sequences. (Running on oeis4.)