# A227295 (b-file synthesized from sequence entry)
0 1
1 4
2 -8
3 32
4 -128
5 768
6 -4608
7 28672
8 -184320
9 1212672
10 -8127488
11 55318528
12 -381329408
13 2656845824
14 -18680250368
15 132373807104
16 -944459216896
17 6778991403008
18 -48915734839296
19 354636355665920
20 -2582006464118784
21 18870792427143168
22 -138396900373037056
23 1018196233480568832
24 -7512565092559355904