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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 1
10, 184, 6304, 416368, 54050896, 13894956304, 7116012826192, 7287811488547552, 14966388560597031328, 61754027537691698147200, 512742718215616709255295136, 8576912248102024129584312864160 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 31 2012
STATUS
approved

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Last modified May 26 13:56 EDT 2024. Contains 372826 sequences. (Running on oeis4.)