A210828 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in lower triangle row major order

4, 47, 1307, 77587, 9532771, 2382934915, 1203182006883, 1223431341113467, 2503405292687579547, 10310784667022325909483, 85532677566328699199301659, 1430104344703313378401501706139, 48228702523491961059131488089168571

Offset

1,1

Links

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

Example

Some solutions for n=3
..0..1..1..1....0..1..0..1....0..1..1..0....0..1..1..1....0..1..2..1
..1..1..1..1....1..0..1..1....1..0..1..0....1..0..1..1....1..1..1..2
..1..1..1..1....0..1..1..1....1..1..0..1....1..1..1..2....2..1..2..2
..1..1..1..2....1..1..1..0....0..0..1..1....1..1..2..1....1..2..2..1

Crossrefs

Sequence in context: A319833 A006438 A251665 * A361560 A333247 A330039

Adjacent sequences: A210825 A210826 A210827 * A210829 A210830 A210831

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved