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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A057651 a(n) = (3*5^n - 1)/2.

Table of values

n a(n)
0 1
1 7
2 37
3 187
4 937
5 4687
6 23437
7 117187
8 585937
9 2929687
10 14648437
11 73242187
12 366210937
13 1831054687
14 9155273437
15 45776367187
16 228881835937
17 1144409179687
18 5722045898437
19 28610229492187
20 143051147460937
21 715255737304687
22 3576278686523437
23 17881393432617187
24 89406967163085937

List of values

[1, 7, 37, 187, 937, 4687, 23437, 117187, 585937, 2929687, 14648437, 73242187, 366210937, 1831054687, 9155273437, 45776367187, 228881835937, 1144409179687, 5722045898437, 28610229492187, 143051147460937, 715255737304687, 3576278686523437, 17881393432617187, 89406967163085937]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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