# A153594 (b-file synthesized from sequence entry)
1 1
2 8
3 51
4 304
5 1769
6 10200
7 58603
8 336224
9 1927953
10 11052712
11 63358307
12 363181200
13 2081791609
14 11932977272
15 68400527259
16 392075513536
17 2247397253921
18 12882196355400
19 73841406542227
20 423262699717616
21 2426163312691977