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A211107 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, two or four distinct values 0
10, 208, 8512, 703744, 117926752, 40133444800, 27783304021216, 39171971918385184, 112587925998400712032, 660174283260849009031456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..2..3..3..3....3..2..1..2....2..3..2..3....3..3..2..3....3..3..0..0

..3..2..3..3....2..2..1..2....3..3..3..2....3..2..2..2....3..0..3..0

..3..3..2..2....1..1..2..2....2..3..2..2....2..2..3..2....0..3..3..3

..3..3..2..1....2..2..2..2....3..2..2..1....3..2..2..2....0..0..3..2

CROSSREFS

Sequence in context: A293970 A245912 A245918 * A335673 A215555 A069863

Adjacent sequences:  A211104 A211105 A211106 * A211108 A211109 A211110

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 31 2012

STATUS

approved

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Last modified October 22 05:36 EDT 2021. Contains 348160 sequences. (Running on oeis4.)