# A105040 (b-file synthesized from sequence entry)
1 0
2 15
3 111
4 3936
5 28320
6 999855
7 7193295
8 253959360
9 1827068736
10 64504677711
11 464068265775
12 16383934179360
13 117871512438240
14 4161454776879855
15 29938900091047311
16 1056993129393303936
17 7604362751613578880
18 268472093411122320015
19 1931478200009757988335