A210836 - OEIS

A210836

Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in lower triangle row major order

2, 25, 1479, 258581, 130785357, 190865489427, 803986116428812, 9774577782495936824, 342988668346099489744721, 34737069299078187196492748928

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A204234 A203747 A278273 * A369675 A088816 A323589

Adjacent sequences: A210833 A210834 A210835 * A210837 A210838 A210839

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved