OFFSET
0,2
LINKS
M. Ciucu, Perfect matchings and perfect powers, arXiv:math/0501521 [math.CO], 2005.
FORMULA
Recurrence: a(n+6) = 13^(4n+12)*a(n), starting with 1, 2, 13, 13^3, 2*13^5, 13^8.
PROG
(PARI) a(n)=if(n<1, n==0, if(n<6, [2, 13, 13^3, 2*13^5, 13^8][n], 13^(4*n-12)*a(n-6)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Ralf Stephan, Feb 19 2005
STATUS
approved