login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A349226 as a simple table

na(n)
01
11
2-1
31
4-2
51
61
7-6
89
9-4
101
11-33
12171
13-247
14108
151
16-289
178619
18-44023
1963340
20-27648
211
22-3413
23911744
24-26978398
25137635215
26-197965148
2786400000
281
29-50070
30160195328
31-42565306462
321258841772303
33-6421706556188
349236348345088
35-4031078400000

[1,1,-1,1,-2,1,1,-6,9,-4,1,-33,171,-247,108,1,
 -289,8619,-44023,63340,-27648,1,-3413,911744,
 -26978398,137635215,-197965148,86400000,1,-50070,
 160195328,-42565306462,1258841772303,
 -6421706556188,9236348345088,-4031078400000]