# A037634 (b-file synthesized from sequence entry)
1 2
2 13
3 81
4 488
5 2929
6 17577
7 105464
8 632785
9 3796713
10 22780280
11 136681681
12 820090089
13 4920540536
14 29523243217
15 177139459305
16 1062836755832
17 6377020534993
18 38262123209961
19 229572739259768
20 1377436435558609