# A121678 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 52
4 425
5 4236
6 49294
7 655096
8 9731313
9 159114880
10 2832245911
11 54400757016
12 1119436524947
13 24532373640334
14 569732648555295
15 13962373137304496
16 359767723241891425
17 9715902692094061488