# A081687 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 20
4 542
5 8132
6 94502
7 964700
8 9138782
9 82619732
10 724180502
11 6213565580
12 52507598222
13 438786732932
14 3636161064902
15 29939329241660
16 245281233244862
17 2001531240407732
18 16280816416067702
19 132088684297864940
20 1069381010972414702
21 8642425579112444132
22 69743202133180068902