# A074620 (b-file synthesized from sequence entry)
0 2
1 14
2 100
3 728
4 5392
5 40544
6 308800
7 2377088
8 18456832
9 144295424
10 1134208000
11 8952731648
12 70896259072
13 562816507904
14 4476410675200
15 35654557073408
16 284296086618112
17 2268726473129984
18 18115958466150400
19 144724547815866368