# A122939 (b-file synthesized from sequence entry)
0 1
1 2
2 3
3 6
4 17
5 70
6 390
7 2776
8 24042
9 244864
10 2862185
11 37715474
12 552685976
13 8910951840
14 156709821779
15 2984589501562
16 61188398397436
17 1343410717573876
18 31445844702847347
19 781689483100388326
20 20564696601659697997