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A210824 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having two, three or four distinct values, and new values 0..3 introduced in lower triangle row major order 1
0, 63, 28448, 30822115, 116038917572, 1674154433221389, 94771192355798810960, 21139413071445258286746935, 18590177181187681705139540637399, 64457007154070058366630524024580865783 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..13

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A001238 A230183 A183552 * A110852 A212859 A239672

Adjacent sequences:  A210821 A210822 A210823 * A210825 A210826 A210827

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified July 14 16:21 EDT 2020. Contains 335729 sequences. (Running on oeis4.)