OFFSET
0,3
COMMENTS
a(n) is also the number of asymmetric digraphs on n nodes with an "Emperor".
FORMULA
a(n) = n*3^((n^2 - 3*n + 2)/2).
PROG
(Maxima) A219116(n):=n*3^((n^2-3*n+2)/2)$ makelist(A219116(n), n, 0, 14); /* Martin Ettl, Nov 13 2012 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy-Robert Joseph, Nov 12 2012
STATUS
approved