# A207821 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 5
4 12
5 69
6 370
7 2609
8 20552
9 183249
10 1817794
11 19867793
12 237126320
13 3068483277
14 42788761294
15 639619513669
16 10202914060472
17 172984071549421
18 3106257794721534
19 58892020126278457
20 1175554242034515780