# A099455 (b-file synthesized from sequence entry)
0 1
1 7
2 36
3 168
4 755
5 3346
6 14747
7 64848
8 284892
9 1251103
10 5493314
11 24118255
12 105887532
13 464877504
14 2040939083
15 8960260498
16 39337870403
17 172703402424
18 758212386132
19 3328747303735
20 14614056052994
21 64159460722903