0,1

a(1) = 4 because 4 = 0! + 1! + 2!;

a(2) = 9 because 9 = 1! + 2! + 3!;

a(3) = 27 because 27 = 1! + 2! + 4!.

Sequence in context: A053810 A076702 A051761 this_sequence A115697 A075783 A098121

Adjacent sequences: A114374 A114375 A114376 this_sequence A114378 A114379 A114380

nonn

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Feb 10 2006