# A011963 (b-file synthesized from sequence entry)
1 0
2 2
3 4
4 10
5 19
6 44
7 76
8 150
9 251
10 432
11 686
12 1094
13 1646
14 2498
15 3608
16 5206
17 7301
18 10160
19 13814
20 18718