# A301334 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 30
4 288
5 3500
6 51882
7 908705
8 18376192
9 421518897
10 10815546010
11 306954846231
12 9547629128208
13 322979502072591
14 11805623386524688
15 463679308850798265
16 19474458473055138816
17 870962008703995217038
18 41324081662873427484240
19 2073203796753598883831150
20 109655938011610286565760400