OFFSET
0,2
LINKS
M. Ciucu, Perfect matchings and perfect powers, arXiv:math/0501521 [math.CO], 2005.
FORMULA
Recurrence: a(n+30) = 3^(4f(n))*a(n), with f a 5-periodic function.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ralf Stephan, Feb 19 2005
STATUS
approved