OFFSET
0,4
COMMENTS
a(n) = A000272(n)^2 for n>=0.
LINKS
M. F. Hasler, Table of n, a(n) for n = 0..32 (corrected by Georg Fischer, Jan 20 2019)
Eric Weisstein's World of Mathematics, Barbell Graph
Eric Weisstein's World of Mathematics, Spanning Tree
FORMULA
a(0)=1 and a(n)=n^(2n-4) for n>=1 (from the comment and the formula for A000272).
MATHEMATICA
Table[n^(2 n - 4), {n, 3, 20}]
PROG
(PARI) A193129=n^(2*n-4) \\ M. F. Hasler, Apr 14 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Jul 16 2011
STATUS
approved