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

10, 208, 8512, 703744, 117926752, 40133444800, 27783304021216, 39171971918385184, 112587925998400712032, 660174283260849009031456

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: A245912 A245918 A368441 * A335673 A215555 A069863

Adjacent sequences: A211104 A211105 A211106 * A211108 A211109 A211110

Keyword

nonn

Author

R. H. Hardin Mar 31 2012

Status

approved