# A087047 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 40
4 800
5 28000
6 1568000
7 131712000
8 15805440000
9 2607897600000
10 573737472000000
11 164088916992000000
12 59728365785088000000
13 27176406432215040000000
14 15218787602040422400000000
15 10348775569387487232000000000
16 8444600864620189581312000000000
17 8182818237816963704291328000000000