# A267980 (b-file synthesized from sequence entry)
0 1
1 5
2 36
3 325
4 3332
5 37044
6 435600
7 5337189
8 67481700
9 874644628
10 11566330256
11 155510720820
12 2120180615056
13 29250721730000
14 407699870875200
15 5733391194015525
16 81260713808878500
17 1159736238615942900
18 16654127124851370000
19 240487877070131159700