# A378551 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 206
4 2200
5 24062
6 267500
7 3009050
8 34150000
9 390265190
10 4484762500
11 51771831146
12 599921125000
13 6974108163778
14 81297715937500
15 949957147566086
16 11123368187500000
17 130487420114543110
18 1533247106445312500
19 18042303960492212810
20 212590835968046875000