cp's OEIS Frontend

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.

A253921 Indices of octagonal numbers (A000567) which are also centered pentagonal numbers (A005891).

Table of values

n a(n)
1 1
2 51
3 271
4 24421
5 130461
6 11770711
7 62881771
8 5673458121
9 30308883001
10 2734595043451
11 14608818724551
12 1318069137485101
13 7041420316350421
14 635306589672775071
15 3393949983662178211
16 306216458153140098961
17 1635876850704853547121
18 147595697523223854923971

List of values

[1, 51, 271, 24421, 130461, 11770711, 62881771, 5673458121, 30308883001, 2734595043451, 14608818724551, 1318069137485101, 7041420316350421, 635306589672775071, 3393949983662178211, 306216458153140098961, 1635876850704853547121, 147595697523223854923971]

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

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