# A173612 (b-file synthesized from sequence entry)
0 1
1 4
2 25
3 144
4 1024
5 7396
6 51076
7 345744
8 2547216
9 19114384
10 145564225
11 1111822336
12 8343726336
13 62292173056
14 459542986816
15 3371072258304
16 25398293867584
17 192578234089536
18 1474993183809600
19 11338593510740224