# A146534 (b-file synthesized from sequence entry)
0 1
1 8
2 24
3 80
4 280
5 1008
6 3696
7 13728
8 51480
9 194480
10 739024
11 2821728
12 10816624
13 41602400
14 160466400
15 620470080
16 2404321560
17 9334424880
18 36300541200
19 141381055200
20 551386115280
21 2153031497760