# A129091 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 13
4 53
5 266
6 800
7 5601
8 44809
9 403282
10 2016412
11 22180533
12 88722135
13 1153387756
14 8073714294
15 40368571473
16 645897143569
17 10980251440674
18 32940754322028
19 625874332118533
20 12517486642370661
21 12517486642370682