# A206300 (b-file synthesized from sequence entry)
0 -1
1 2
2 6
3 32
4 210
5 1536
6 12012
7 98304
8 831402
9 7208960
10 63740820
11 572522496
12 5209363380
13 47915728896
14 444799488600
15 4161823309824
16 39209074920090
17 371626340253696
18 3541117629057540