OFFSET
0,1
MAPLE
f:=n->3^n; g:=n->f(f(n+1))-f(f(n)); [seq(g(n), n=0..4)]; # N. J. A. Sloane, Feb 14 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 12 2005
STATUS
approved