# A150417 (b-file synthesized from sequence entry) 0 1 1 2 2 7 3 24 4 95 5 377 6 1586 7 6706 8 29299 9 128291 10 574424 11 2573433 12 11715124 13 53352034 14 245809320 15 1133194148 16 5269541980 17 24520813745 18 114872653433 19 538496175196 20 2537931282207 21 11968821803008 22 56690873984010 23 268687332993062 24 1278004023471879 25 6082571262922215 26 29035668775116375 27 138688338690247579