# A288950 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 2
4 15
5 140
6 1575
7 20790
8 315315
9 5405400
10 103378275
11 2182430250
12 50414138775
13 1264936572900
14 34258698849375
15 996137551158750
16 30951416768146875
17 1023460181133390000
18 35885072600989486875
19 1329858572860198631250
20 51938365373373313209375