A211102 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or two distinct values

10, 184, 6304, 416368, 54050896, 13894956304, 7116012826192, 7287811488547552, 14966388560597031328, 61754027537691698147200, 512742718215616709255295136, 8576912248102024129584312864160

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A239764 A364987 A179521 * A121973 A223146 A365175

Adjacent sequences: A211099 A211100 A211101 * A211103 A211104 A211105

Keyword

nonn

Author

R. H. Hardin Mar 31 2012

Status

approved