# A247664 (b-file synthesized from sequence entry)
0 1
1 25
2 150
3 675
4 2450
5 7876
6 22825
7 61550
8 155925
9 375875
10 867627
11 1930775
12 4159100
13 8708150
14 17771725
15 35447503
16 69243250
17 132718300
18 249979625
19 463348600
20 846149380