# A063031 (b-file synthesized from sequence entry)
0 0
1 1
2 1
3 3
4 11
5 43
6 182
7 806
8 3687
9 17297
10 82753
11 402207
12 1980407
13 9857715
14 49522564
15 250768564
16 1278600022
17 6558731904
18 33823966611
19 175264755549
20 912043488146
21 4764361204130
22 24974974692240
23 131335127655540