# A251575 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 65
4 1505
5 51505
6 2354725
7 135258625
8 9373203425
9 761486105825
10 71001537157925
11 7475144493546625
12 877222642396170625
13 113551974107296500625
14 16073867927431440597125
15 2470217878902686107522625
16 409596824402404827033730625
17 72890993386914239524503090625
18 13857243751694786173837746653125