# A090336 (b-file synthesized from sequence entry)
0 1
1 0
2 -8
3 24
4 64
5 -480
6 -3968
7 34944
8 354304
9 -4062720
10 -51734528
11 724568064
12 11070521344
13 -183240744960
14 -3266330329088
15 62382319632384
16 1270842139869184
17 -27507470234419200
18 -630424777639067648
19 15250953398036987904
20 388362339077349965824