# A173820 (b-file synthesized from sequence entry)
0 1
1 2
2 -4
3 1
4 16
5 -64
6 56
7 -16
8 1
9 4096
10 -32768
11 75776
12 -77824
13 39296
14 -9728
15 1184
16 -64
17 1
18 4294967296
19 -68719476736
20 375809638400
21 -1043677052928
22 1696981843968
23 -1726845288448
24 1143073669120
25 -506453819392
26 152912134144
27 -31653363712