# A136660 (b-file synthesized from sequence entry)
0 1
1 18
2 255
3 3465
4 47880
5 687960
6 10372320
7 164656800
8 2754259200
9 48518870400
10 899026128000
11 17495593315200
12 356995102464000
13 7625049239808000
14 170196434343936000
15 3963602854987776000
16 96160451873181696000