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”).

A137296 as a simple table

na(n)
11
20
3-1
4-1
5-2
61
7-1
8-1
97
10-1
111
1210
136
14-26
151
161
1745
18-36
19-224
20127
21-1
22-1
23-306
24-957
251172
263709
27-746
281
29-1
30-2357
31-14379
3237397
3367621
34-106887
355167
36-1
371
3820690
39803492
401325962
41-4532586
42-6300786
434147412
44-41066
451
461
47201733
4849001186
4951278654
50-546386064
51-208428708
521389178142

[1,0,-1,-1,-2,1,-1,-1,7,-1,1,10,6,-26,1,1,45,-36,
 -224,127,-1,-1,-306,-957,1172,3709,-746,1,-1,
 -2357,-14379,37397,67621,-106887,5167,-1,1,20690,
 803492,1325962,-4532586,-6300786,4147412,-41066,1,
 1,201733,49001186,51278654,-546386064,-208428708,
 1389178142]