# A126417 (b-file synthesized from sequence entry)
0 1
1 30
2 144
3 700
4 3418
5 16736
6 82098
7 403274
8 1982980
9 9758780
10 48058110
11 236801010
12 1167371680
13 5757241450
14 28403776808
15 140176438936
16 691982963722
17 3416834220692
18 16875210619810
19 83360735329998
20 411862694955416