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.

A253477 Indices of centered heptagonal numbers (A069099) which are also centered triangular numbers (A005448).

Table of values

n a(n)
1 1
2 10
3 46
4 1045
5 5005
6 114886
7 550450
8 12636361
9 60544441
10 1389884770
11 6659338006
12 152874688285
13 732466636165
14 16814825826526
15 80564670640090
16 1849477966229521
17 8861381303773681
18 203425761459420730
19 974671378744464766
20 22374984282570050725

List of values

[1, 10, 46, 1045, 5005, 114886, 550450, 12636361, 60544441, 1389884770, 6659338006, 152874688285, 732466636165, 16814825826526, 80564670640090, 1849477966229521, 8861381303773681, 203425761459420730, 974671378744464766, 22374984282570050725]

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

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