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.

A253821 Indices of octagonal numbers (A000567) which are also centered triangular numbers (A005448).

Table of values

n a(n)
1 1
2 181
3 589
4 208489
5 679321
6 240595741
7 783935461
8 277647276241
9 904660842289
10 320404716185989
11 1043977828065661
12 369746764831354681
13 1204749508926930121
14 426687446210667115501
15 1390279889323849293589
16 492396943180345019933089
17 1604381787530213157871201

List of values

[1, 181, 589, 208489, 679321, 240595741, 783935461, 277647276241, 904660842289, 320404716185989, 1043977828065661, 369746764831354681, 1204749508926930121, 426687446210667115501, 1390279889323849293589, 492396943180345019933089, 1604381787530213157871201]

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

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