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A210405 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order 0
7, 2520, 7380816, 178971208720, 35812807522735456, 59168572189285825092176, 807064033391096001306908915584, 90885346773699848753942253937462269824 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A210413

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A203382 A249352 A264743 * A203705 A354027 A178172

Adjacent sequences: A210402 A210403 A210404 * A210406 A210407 A210408

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2012

STATUS

approved

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Last modified December 2 12:34 EST 2022. Contains 358496 sequences. (Running on oeis4.)