# A051821 (b-file synthesized from sequence entry)
1 1
2 6
3 30
4 273
5 3321
6 38545
7 413435
8 4179623
9 40717550
10 389610397
11 3704647927
12 35103992478
13 330893886987
14 3100780107689
15 28983549003377
16 272016949455533