A210810 - OEIS

A210810

Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having one or three distinct values, and new values 0..2 introduced in lower triangle row major order

1, 6, 51, 652, 13625, 466058, 26123303, 2397815264, 360393055117, 88675989046142, 35717797661887219, 23549404183669259508

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A356925 A134525 A125865 * A134276 A372333 A337591

Adjacent sequences: A210807 A210808 A210809 * A210811 A210812 A210813

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 26 2012

STATUS

approved