# A099367 (b-file synthesized from sequence entry)
0 0
1 1
2 49
3 2500
4 127449
5 6497401
6 331240000
7 16886742601
8 860892632649
9 43888637522500
10 2237459621014849
11 114066552034234801
12 5815156694124960000
13 296458924848338725201
14 15113590010571150025249
15 770496631614280312562500