# A028474 (b-file synthesized from sequence entry)
0 1
1 1
2 233
3 2131
4 145601
5 2332097
6 106912793
7 2188978117
8 82741005829
9 1937528668711
10 65743732590821
11 1666961188795475
12 53060477521960000
13 1412218550274852671
14 43242613716069407953
15 1185802123987680144427
16 35457442115448212075033
17 990424779934371836605849