A210814 - OEIS

A210814

Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having two distinct values, and new values 0..3 introduced in lower triangle row major order

0, 1, 100, 6684, 599536, 82309141, 18679289180, 7191882371599, 4794826023217991, 5595844097524199026, 11523237615776387849625, 42103142637653897079485507

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

OFFSET

1,3

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

..0..0..0..3....0..0..2..2....0..0..0..0....1..2..2..2....2..2..1..1

..2..0..3..3....1..0..2..3....0..2..0..3....2..1..2..3....0..2..1..3

CROSSREFS