# A003433 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 16
5 48
6 160
7 576
8 4096
9 14336
10 73728
11 327680
12 2985984
13 14929920
14 77635584
15 418037760
16 4294967296
17 21474836480
18 146028888064
19 894426939392
20 10240000000000
21 59392000000000
22 409600000000000