# A084729 (b-file synthesized from sequence entry)
1 2
2 3
3 7
4 73
5 1801
6 21601
7 151201
8 8467201
9 304819201
10 18289152001
11 201180672001
12 4828336128001
13 502146957312001
14 56240459218944001
15 12654103324262400001
16 1417259572317388800001
17 144560476376373657600001