# A074521 (b-file synthesized from sequence entry)
0 3
1 15
2 101
3 729
4 5393
5 40545
6 308801
7 2377089
8 18456833
9 144295425
10 1134208001
11 8952731649
12 70896259073
13 562816507905
14 4476410675201
15 35654557073409
16 284296086618113
17 2268726473129985
18 18115958466150401
19 144724547815866369