A216461 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order

2, 2, 7, 15, 203, 716, 17733, 83440, 3137543, 18171918, 942426468, 6423127757, 433245459699, 3376465219485, 284615058572536, 2486327138729353, 254421641605158901, 2454996141671330713, 298288744434946125073

Offset

1,1

Comments

Row 3 of A216460

Links

R. H. Hardin, Table of n, a(n) for n = 1..41

Example

Some solutions for n=4
..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
..x..2..x..0....x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..0
..0..x..3..x....3..x..4..x....4..x..5..x....0..x..1..x....3..x..4..x

Crossrefs

Sequence in context: A290646 A133602 A137249 * A238833 A192921 A051769

Adjacent sequences: A216458 A216459 A216460 * A216462 A216463 A216464

Keyword

nonn

Author

R. H. Hardin Sep 07 2012

Status

approved