# A052647 (b-file synthesized from sequence entry)
0 2
1 2
2 10
3 48
4 408
5 3840
6 46800
7 645120
8 10362240
9 185794560
10 3719520000
11 81749606400
12 1962469555200
13 51011754393600
14 1428416301312000
15 42849873690624000
16 1371216880889856000
17 46620662575398912000