# A037725 (b-file synthesized from sequence entry)
1 2
2 12
3 75
4 451
5 2708
6 16248
7 97491
8 584947
9 3509684
10 21058104
11 126348627
12 758091763
13 4548550580
14 27291303480
15 163747820883
16 982486925299
17 5894921551796
18 35369529310776
19 212217175864659
20 1273303055187955
21 7639818331127732