# A335128 (b-file synthesized from sequence entry)
1 1
2 24
3 240
4 504
5 65520
6 131040
7 171864
8 138181680
9 6814407600
10 20174525280
11 45185409360
12 558781423200
13 685933859520
14 2601256998740400
15 4578654981700800
16 15571124394460034400
17 375159113055066740400
18 124708934978441512498800
19 127589793288205521873600
20 8644416283014847832296800
21 29217965124687229769336640