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A216340 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 4Xn array with new integer colors introduced in row major order 1
2, 10, 52, 726, 12840, 373780, 12297870, 580853761, 29562890980, 2004648246554, 142953068558998, 12954739605661928, 1216988850964527370, 140585911310155419266, 16679506383419809650408, 2374936932537133281235971 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A216338

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=4

..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x

..x..2..x..3....x..2..x..3....x..2..x..3....x..0..x..1....x..2..x..3

..4..x..0..x....4..x..5..x....3..x..1..x....2..x..3..x....0..x..2..x

..x..5..x..3....x..3..x..0....x..3..x..1....x..2..x..1....x..0..x..4

CROSSREFS

Sequence in context: A104497 A166694 A238796 * A080117 A080118 A086546

Adjacent sequences:  A216337 A216338 A216339 * A216341 A216342 A216343

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2012

STATUS

approved

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Last modified June 25 03:59 EDT 2022. Contains 354835 sequences. (Running on oeis4.)