0,4
n! * { 1 - sum[ k=0..floor(n/3) ] (-1)^k / (3^k * k!) }.
Sequence in context: A181326 A186947 A071007 * A187071 A154626 A003305
Adjacent sequences: A027614 A027615 A027616 * A027618 A027619 A027620
nonn
Joe Keane (jgk(AT)jgk.org)