OFFSET
2,1
COMMENTS
a(6) (shown) = 1386*2196^21, a(7) (too large to show) = 16814*37004^27.
LINKS
Elmar Teufl and Stephan Wagner, Exact and asymptotic enumeration of perfect matchings in self-similar graphs, Discrete Mathematics 309(23-24) (2009), 6612-6625; see Table 1 (p. 6619).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 16 2019
STATUS
approved