A215741 Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the odd squares of an n X 4 array with new integer colors introduced in row major order.

1, 1, 2, 8, 78, 1250, 29084, 908408, 36224616, 1780689974, 105135525426, 7307547766968, 588450707721862, 54186944514040018, 5644227659101270900, 658939392885787463080, 85544557333123653732104, 12265193268786056481323974, 1930586336858816841621652994

Offset

0,3

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

Example

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

Crossrefs

Column 4 of A215745 and column 4 of A215847.

Sequence in context: A329968 A093062 A057984 * A365360 A071254 A063528

Adjacent sequences: A215738 A215739 A215740 * A215742 A215743 A215744

Keyword

nonn

Author

R. H. Hardin, Aug 22 2012

Extensions

a(0)=1 prepended and terms a(15) and beyond from Andrew Howroyd, Jun 25 2017

Status

approved