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A215924 T(n,k)=Number of diagonal and antidiagonal neighbor colorings of the odd squares of an nXk array with new integer colors introduced in row major order 6
1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 5, 4, 5, 2, 5, 15, 42, 42, 15, 5, 5, 52, 136, 602, 136, 52, 5, 15, 203, 2906, 12840, 12840, 2906, 203, 15, 15, 877, 12840, 373780, 322768, 373780, 12840, 877, 15, 52, 4140, 433252, 14050312, 87852626, 87852626, 14050312, 433252 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,7
COMMENTS
Table starts
..1.....1.........1.............2..................2.......................5
..1.....1.........2.............5.................15......................52
..1.....2.........4............42................136....................2906
..2.....5........42...........602..............12840..................373780
..2....15.......136.........12840.............322768................87852626
..5....52......2906........373780...........87852626.............33093356640
..5...203.....12840......14050312.........4044766240..........18383354944364
.15...877....433252.....656404264......2227156082842.......14216420563705724
.15..4140...2387180...37060650272....157752739276184....14670987605491079080
.52.21147.113503692.2475181138384.148049849095504726.19558496206477343793824
LINKS
EXAMPLE
Some solutions for n=3 k=4
..x..0..x..1....x..0..x..0....x..0..x..1....x..0..x..1....x..0..x..1
..1..x..2..x....1..x..2..x....2..x..3..x....2..x..3..x....2..x..2..x
..x..3..x..1....x..3..x..0....x..0..x..1....x..4..x..0....x..1..x..1
CROSSREFS
Column 2 is A000110(n-1)
Column 4 is A208302
Column 6 is A215902
Even squares: A215904
Sequence in context: A263342 A089452 A162487 * A115101 A241148 A172414
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Aug 27 2012
STATUS
approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)