# A168981 (b-file synthesized from sequence entry)
0 1
1 16
2 240
3 3600
4 54000
5 810000
6 12150000
7 182250000
8 2733750000
9 41006250000
10 615093750000
11 9226406250000
12 138396093750000
13 2075941406250000
14 31139121093750000
15 467086816406250000
16 7006302246093750000