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A210855 Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in lower triangle row major order 1
4, 46, 1139, 55516, 5327304, 1010944060, 380704421087, 285205710360936, 425825333933157003, 1268871858354238286927, 7554384371145384136117854, 89942576436863983961350601461, 2143078341798100623746679385130235 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A000657 A001623 A188634 * A324228 A002077 A113096

Adjacent sequences:  A210852 A210853 A210854 * A210856 A210857 A210858

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2012

STATUS

approved

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Last modified August 23 22:45 EDT 2019. Contains 326254 sequences. (Running on oeis4.)