# A212913 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 8
4 44
5 308
6 2648
7 26912
8 315536
9 4193744
10 62302496
11 1023057536
12 18400342208
13 359733922880
14 7595810693504
15 172270928222720
16 4176595617747200
17 107793463235860736
18 2950683535353324032
19 85386983313510877184
20 2604521649171407301632
21 83519383797513832420352