A211105 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, two or three distinct values

16, 928, 196480, 151767424, 427712112640, 4397802725483392, 164979998407434893440, 22580741254744671390333952, 11276035715844307701828163309696, 20544048912459992331220711095896934784

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Sequence in context: A260620 A290940 A173953 * A276637 A211081 A197449

Adjacent sequences: A211102 A211103 A211104 * A211106 A211107 A211108

Keyword

nonn

Author

R. H. Hardin Mar 31 2012

Status

approved