# A115083 (b-file synthesized from sequence entry)
0 1
1 3
2 7
3 31
4 150
5 853
6 5251
7 35109
8 249332
9 1873214
10 14754858
11 121380083
12 1037889452
13 9197178411
14 84207477581
15 794810896751
16 7717524260040
17 76956293344620
18 786822019659120
19 8237319107295510
20 88193381907972840