# A145860 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 6 5 16 6 49 7 169 8 742 9 3848 10 23784 11 176890 12 1574720 13 16764539 14 214487123 15 3284115855 16 60203667877 17 1323062783686 18 34845447884285 19 1099257570874298 20 41549582286031187 21 1881714538522030500 22 102107501292816609976