A215744 Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the odd squares of an n X 7 array with new integer colors introduced in row major order.

1, 2, 52, 1474, 908408, 190497926, 621070325112, 358497142120168, 3338879032079931702, 3860992971424257181362, 78078252717220869748888110, 153766323558842595930324743030, 5766825640795432616276139021743234, 17510035018053058214986518337659927378

Offset

0,2

Links

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

Example

Some solutions for n=3:
..x..0..x..1..x..2..x....x..0..x..1..x..2..x....x..0..x..1..x..2..x
..1..x..3..x..0..x..4....3..x..4..x..5..x..1....3..x..4..x..3..x..5
..x..5..x..4..x..6..x....x..6..x..7..x..0..x....x..5..x..6..x..1..x

Crossrefs

Column 7 of A215745.

Sequence in context: A101930 A297756 A174779 * A099882 A216611 A246485

Adjacent sequences: A215741 A215742 A215743 * A215745 A215746 A215747

Keyword

nonn

Author

R. H. Hardin, Aug 22 2012

Extensions

a(0)=1 prepended and terms a(7) and beyond from Andrew Howroyd, Jun 26 2017

Status

approved