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A103643 Number of tilings of a special lattice of order n. 0
1, 2, 6, 6, 6, 6, 27, 486, 486, 486, 486, 6561, 531441, 531441, 531441, 531441, 43046721, 10460353203, 10460353203, 10460353203, 10460353203, 7625597484987, 5559060566555523, 5559060566555523, 5559060566555523 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

LINKS

M. Ciucu, Perfect matchings and perfect powers

FORMULA

Recurrence: a(n+30) = 3^(4f(n))*a(n), with f a 5-periodic function.

CROSSREFS

Sequence in context: A184409 A137479 A048765 * A079892 A096014 A071888

Adjacent sequences:  A103640 A103641 A103642 * A103644 A103645 A103646

KEYWORD

nonn

AUTHOR

Ralf Stephan (ralf(AT)ark.in-berlin.de), Feb 19 2005

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Last modified February 15 13:47 EST 2012. Contains 205808 sequences.