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”).

A121440 as a simple table

na(n)
01
1-3
21
30
4-5
51
6-12
74
8-8
91
10-129
11-22
1218
13-12
141
15-1785
16-238
17-51
1851
19-17
201
21-30291
22-3634
23-345
24-161
25115
26-23
271
28-608565
29-66750
30-6111
31-285
32-505
33225
34-30
351
36-14112744
37-1432296
38-122227
39-9177
40665
41-1387
42399
43-38
441
45-370746528
46-35129022
47-2818543
48-196037
49-14335
504841
51-3337
52658

[1,-3,1,0,-5,1,-12,4,-8,1,-129,-22,18,-12,1,-1785,
 -238,-51,51,-17,1,-30291,-3634,-345,-161,115,-23,
 1,-608565,-66750,-6111,-285,-505,225,-30,1,
 -14112744,-1432296,-122227,-9177,665,-1387,399,
 -38,1,-370746528,-35129022,-2818543,-196037,
 -14335,4841,-3337,658]