# A210661 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 41 4 464 5 6679 6 116534 7 2387223 8 56126216 9 1488936405 10 43981641232 11 1431351648253 12 50877935705904 13 1960987188622955 14 81454893191133968 15 3627186997857749259 16 172364960657294194944 17 8705953783492490785801 18 465732966748611591349632 19 26305402198153236286685809 20 1564288763576093814775234304