# A073964 (b-file synthesized from sequence entry)
1 0
2 2
3 6
4 20
5 100
6 600
7 3150
8 15750
9 78000
10 390000
11 1952500
12 9768750
13 48831250
14 244125000
15 1220625000
16 6103437500
17 30517656250
18 152588281250
19 762939062500
20 3814695312500
21 19073484375000
22 95367441406250
23 476837167968750
24 2384185742187500
25 11920928710937500