# A052784 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 0
4 0
5 0
6 720
7 7560
8 50400
9 272160
10 1300320
11 5738040
12 23958000
13 96061680
14 373477104
15 1417295880
16 5274360000
17 19313985600
18 69770966976
19 249130574424
20 880629138000