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A210135 Number of (n+1)X(n+1) 0..3 arrays containing all values 0..3 with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order 0
1, 221, 159327, 363492269, 3047709295897, 100540191960863826, 13475932703981552094893, 7453689884209460671972584992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A210143

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A220723 A011816 A048902 * A013548 A300517 A083958

Adjacent sequences:  A210132 A210133 A210134 * A210136 A210137 A210138

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 17 2012

STATUS

approved

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Last modified November 28 08:12 EST 2021. Contains 349401 sequences. (Running on oeis4.)