# A069668 (b-file synthesized from sequence entry)
1 1
2 25
3 121
4 2401
5 10201
6 301401
7 1002001
8 25010001
9 100020001
10 2500100001
11 10000200001
12 250001000001
13 1000002000001
14 25000010000001
15 100000020000001
16 2500000100000001
17 10000000200000001
18 250000001000000001