# A078994 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 -2
4 -24
5 -138
6 -500
7 1200
8 56256
9 904912
10 11937696
11 144543360
12 1639736320
13 16965191808
14 141946949376
15 376837224448
16 -23412830208000
17 -860170849536000
18 -22132932250013696
19 -501053473607319552
20 -10543220910009286656
21 -208356118642682839040