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.

A253459 Indices of centered square numbers (A001844) which are also centered heptagonal numbers (A069099).

Table of values

n a(n)
1 1
2 21
3 148
4 5208
5 37465
6 1322685
7 9515836
8 335956656
9 2416984753
10 85331667813
11 613904611300
12 21673907667720
13 155929354285321
14 5505087215932941
15 39605442083860108
16 1398270478939299168
17 10059626359946181985
18 355155196563366055605
19 2555105489984246363956

List of values

[1, 21, 148, 5208, 37465, 1322685, 9515836, 335956656, 2416984753, 85331667813, 613904611300, 21673907667720, 155929354285321, 5505087215932941, 39605442083860108, 1398270478939299168, 10059626359946181985, 355155196563366055605, 2555105489984246363956]

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

Content is available under The OEIS End-User License Agreement.