A210811 Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having two or three distinct values, and new values 0..2 introduced in lower triangle row major order

1, 77, 6229, 1262225, 726073329, 1209785791625, 5850732086362939, 82137353908070795417, 3347356112526068595635969, 395998823277249889265284827949, 135993026862887326817175277464490671

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Sequence in context: A217962 A180837 A361112 * A107787 A099638 A046191

Adjacent sequences: A210808 A210809 A210810 * A210812 A210813 A210814

Keyword

nonn

Author

R. H. Hardin Mar 26 2012

Status

approved