# A025133 (b-file synthesized from sequence entry)
3 9
4 256
5 5825
6 117561
7 2229206
8 40645536
9 721957977
10 12587900665
11 216494284886
12 3684700444921
13 62202196684966
14 1043201004995254
15 17402695775329724
16 289035985511398816
17 4782824895703150121
18 78896686234320906753
19 1297987090781736899270
20 21304819716551897181561