# A000380 (b-file synthesized from sequence entry)
3 6
4 8
5 40
6 176
7 1421
8 10352
9 93114
10 912920
11 9929997
12 117970704
13 1521176826
14 21150414880
15 315400444070
16 5020920314016
17 84979755347122
18 1523710321272384
19 28851091193764023
20 575253584489378040
21 12047084261153160394
22 264377395040950523112
23 6066972656940255290199