# A004346 (b-file synthesized from sequence entry) 4 1 5 25 6 435 7 6545 8 91390 9 1221759 10 15890700 11 202927725 12 2558620845 13 31966749880 14 396704524216 15 4898229264825 16 60246643120300 17 738799683460650 18 9038619861406740 19 110375347398090219 20 1345860629046814650