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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 0
2, 25, 1479, 258581, 130785357, 190865489427, 803986116428812, 9774577782495936824, 342988668346099489744721, 34737069299078187196492748928 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2012
STATUS
approved

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Last modified March 29 06:44 EDT 2024. Contains 371265 sequences. (Running on oeis4.)