# A099898 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 84
4 276
5 1108
6 5396
7 20564
8 65812
9 263252
10 1316116
11 5525588
12 18153748
13 72352852
14 352326932
15 1342197844
16 4295033108
17 17180132436
18 85900662036
19 360782778452
20 1185429127444
21 4758896116820
22 23175995856148
23 88323049672788