# A335111 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 6
4 -8
5 40
6 48
7 784
8 5248
9 49536
10 490240
11 5403904
12 64822272
13 842742784
14 11798284288
15 176974510080
16 2831591636992
17 48137058942976
18 866467058614272
19 16462874118651904
20 329257482362552320
21 6914407129635618816
22 152116956851937476608
23 3498690007594658430976