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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. 2
1, 1, 2, 8, 78, 1250, 29084, 908408, 36224616, 1780689974, 105135525426, 7307547766968, 588450707721862, 54186944514040018, 5644227659101270900, 658939392885787463080, 85544557333123653732104, 12265193268786056481323974, 1930586336858816841621652994 (list; graph; refs; listen; history; text; internal format)
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 * A071254 A063528 A259705

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

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Last modified June 19 10:09 EDT 2021. Contains 345126 sequences. (Running on oeis4.)