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”).

A131891 as a simple table

na(n)
01
11
25
310
410
55
61
725
8250
91250
103125
113125
1231250
13125000
14250000
15250000
16100000
17500000
181000000
191000000
20500000
21100000
22250000
23250000
24125000
2531250
263125
273125
281250
29250
3025
311
32125
336250
34156250
351953125
369765625
37488281250
389765625000

[1,1,5,10,10,5,1,25,250,1250,3125,3125,31250,
 125000,250000,250000,100000,500000,1000000,
 1000000,500000,100000,250000,250000,125000,31250,
 3125,3125,1250,250,25,1,125,6250,156250,1953125,
 9765625,488281250,9765625000]