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A210856 Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having one or three distinct values, and new values 0..2 introduced in lower triangle row major order 0
2, 7, 52, 653, 13626, 466059, 26123304, 2397815265, 360393055118, 88675989046143, 35717797661887220, 23549404183669259509, 25414418850237694865002 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A220092 A138737 A216086 * A046662 A237195 A275597

Adjacent sequences:  A210853 A210854 A210855 * A210857 A210858 A210859

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2012

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)