A198289 Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor

272, 413375, 706120206, 1275102148950, 2366880827870877, 4452440424252727173, 8428943308912271720848, 16004596485813250391893906, 30431540879946488350797932499, 57901155886923326494331172396019

Offset

1,1

Comments

Column 3 of A198290

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

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

Crossrefs

Sequence in context: A283789 A331655 A225833 * A198595 A028467 A203758

Adjacent sequences: A198286 A198287 A198288 * A198290 A198291 A198292

Keyword

nonn

Author

R. H. Hardin Oct 23 2011

Status

approved