# A002772 (b-file synthesized from sequence entry)
2 2
3 6
4 22
5 101
6 546
7 3502
8 25586
9 214062
10 1987516
11 20599076
12 232482372
13 2876191276
14 38228128472
15 549706132536
16 8408517839416
17 137788390312712
18 2383879842920976
19 43846851982943152
20 846470648320690736
21 17266870434276713616
22 367937854493289655072