# A060537 (b-file synthesized from sequence entry)
0 1
1 21
2 105
3 266
4 1386
5 6678
6 25403
7 100506
8 384678
9 1393903
10 4831890
11 15955485
12 50080478
13 149211930
14 421819950
15 1132236630
16 2890927935
17 7040892159
18 16411041500
19 36733789575
20 79230165105
21 165194651065
22 333926559540