1,4
a(4)=16
Sequence in context: A085538 A091363 A138407 * A204031 A025930 A125404
Adjacent sequences: A094854 A094855 A094856 * A094858 A094859 A094860
nonn
Alain Goupil (goupil(AT)math.uqam.ca), Jun 14 2004