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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

R. H. Hardin, Table of n, a(n) for n = 1..14

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 A188895

Adjacent sequences:  A210854 A210855 A210856 * A210858 A210859 A210860

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2012

STATUS

approved

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Last modified November 21 17:44 EST 2017. Contains 295004 sequences.