# A335539 (b-file synthesized from sequence entry)
0 1
1 1
2 9
3 1
4 1350
5 1
6 52920
7 1
8 1134000
9 1
10 11290752
11 1
12 74373979680000
13 1
14 8006169600
15 1
16 12147360825600000
17 1
18 56625794240311296000
19 1
20 3311787858630451200000
21 1
22 451287524451778560000
23 1
24 48168123888308960600064000000
25 1
26 10738530029998374912000000
27 1