# A006195 (b-file synthesized from sequence entry)
0 1
1 -2
2 8
3 -40
4 222
5 -1316
6 8160
7 -52272
8 343220
9 -2297682
10 15623760
11 -107611608
12 749209832
13 -5264005060
14 37277153920
15 -265788870480
16 1906489923022
17 -13747860118724
18 99606357848920
19 -724732875917064
20 5293303253527704
21 -38795196044205056