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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
1, 2, 52, 1474, 908408, 190497926, 621070325112, 358497142120168, 3338879032079931702, 3860992971424257181362, 78078252717220869748888110, 153766323558842595930324743030, 5766825640795432616276139021743234, 17510035018053058214986518337659927378 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 25 06:20 EDT 2021. Contains 345452 sequences. (Running on oeis4.)