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

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

Sequence in context: A053109 A151647 A245666 * A065689 A260859 A117687

Adjacent sequences: A210811 A210812 A210813 * A210815 A210816 A210817

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved