# A051199 (b-file synthesized from sequence entry)
0 0
1 8
2 40
3 216
4 980
5 4368
6 18468
7 77520
8 319440
9 1307448
10 5310448
11 21474180
12 86488020
13 347373600
14 1391956192
15 5567901768
16 22239898848
17 88732378800
18 353696824152
19 1408831480056
20 5608231863080
21 22314239255088