# A002704 (b-file synthesized from sequence entry)
0 2
1 26
2 938
3 42800
4 2130458
5 111557594
6 6041272682
7 335089258634
8 18922687509962
9 1083572842675610
10 62744027461625648
11 3666433604712457466
12 215879610645469496234
13 12792865816027823374874
14 762278349313657804740842
15 45638342462133835019322554