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

0, 63, 28448, 30822115, 116038917572, 1674154433221389, 94771192355798810960, 21139413071445258286746935, 18590177181187681705139540637399, 64457007154070058366630524024580865783

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