# A055847 (b-file synthesized from sequence entry) 0 1 1 6 2 49 3 392 4 3136 5 25088 6 200704 7 1605632 8 12845056 9 102760448 10 822083584 11 6576668672 12 52613349376 13 420906795008 14 3367254360064 15 26938034880512 16 215504279044096 17 1724034232352768 18 13792273858822144 19 110338190870577152