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A210857 Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having two or three distinct values, and new values 0..2 introduced in lower triangle row major order 1
4, 94, 6400, 1265336, 726175112, 1209791788480, 5850732722422240, 82137354029529991584, 3347356112567824150084288, 395998823277275732737683780672, 135993026862887355613684481546308800 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..0....0..1..1..2....0..1..1..1....0..0..2..2....0..1..0..1
..1..0..0..1....1..0..2..0....1..2..0..1....0..1..0..2....1..2..1..1
..0..0..2..2....1..2..2..2....1..0..2..0....2..0..0..2....0..1..0..2
..0..1..2..0....2..0..2..1....1..1..0..0....2..2..2..0....1..1..2..2
CROSSREFS
Sequence in context: A221389 A220374 A220429 * A220682 A210926 A302121
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 28 2012
STATUS
approved

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)