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A216832 Number of city-block distance 1 permutations of a side-n hexagonal array. 0
0, 36, 198576, 427073321712, 160091486928671945664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3 (movement: 0=nw 1=ne 2=e 3=se 4=sw 5=w)

...3.3.3.......2.5.3.......3.2.5.......3.2.3.......2.4.3

..1.1.1.3.....4.5.4.0.....4.0.4.3.....4.0.0.5.....3.0.4.0

.1.3.2.4.4...3.1.1.2.5...1.3.1.3.0...1.4.2.4.4...1.5.2.0.4

..0.0.0.4.....1.4.2.5.....3.0.4.0.....1.1.3.1.....3.2.5.1

...0.5.5.......1.2.5.......0.2.0.......1.5.5.......0.2.5

CROSSREFS

Sequence in context: A133015 A203270 A185960 * A013839 A271386 A065752

Adjacent sequences:  A216829 A216830 A216831 * A216833 A216834 A216835

KEYWORD

nonn,hard,more

AUTHOR

R. H. Hardin Sep 17 2012

STATUS

approved

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Last modified February 23 07:28 EST 2018. Contains 299473 sequences. (Running on oeis4.)