# A191577 (b-file synthesized from sequence entry)
0 1
1 3
2 12
3 54
4 228
5 540
6 -3840
7 -50400
8 229824
9 11430720
10 -10886400
11 -5388768000
12 -24417676800
13 4733158510080
14 58758168268800
15 -7139902049280000
16 -165279578720256000
17 17368039270213632000
18 645434329747208601600
19 -64796782524129976320000
20 -3555479864273411063808000