# A258799 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 13
4 61
5 324
6 1800
7 10340
8 60969
9 366486
10 2237120
11 13829487
12 86394782
13 544547651
14 3458637273
15 22113504345
16 142212705879
17 919294844898
18 5969839457411
19 38927450022860
20 254776529381625
21 1673102335692514
22 11020847332241873
23 72798664086854460