A210855 Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in lower triangle row major order

4, 46, 1139, 55516, 5327304, 1010944060, 380704421087, 285205710360936, 425825333933157003, 1268871858354238286927, 7554384371145384136117854, 89942576436863983961350601461, 2143078341798100623746679385130235

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A001623 A188634 A331978 * A324228 A002077 A113096

Adjacent sequences: A210852 A210853 A210854 * A210856 A210857 A210858

Keyword

nonn

Author

R. H. Hardin Mar 28 2012

Status

approved