# A051196 (b-file synthesized from sequence entry)
0 0
1 5
2 21
3 81
4 330
5 1287
6 4995
7 19448
8 75582
9 293895
10 1144066
11 4457400
12 17383734
13 67863915
14 265182525
15 1037157858
16 4059928950
17 15905368710
18 62359142274
19 244662670200
20 960566918220
21 3773655743715
22 14833897694226
23 58343356817424