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.

A253823 Octagonal numbers (A000567) which are also centered triangular numbers (A005448).

Table of values

n a(n)
1 1
2 97921
3 1039585
4 130402572385
5 1384429704481
6 173658931280825761
7 1843664419471976641
8 231264030011583194717761
9 2455233718711319470593985
10 307977546462671843639087352385
11 3269669116478082433043125969441
12 410138010309759307549971991199125921

List of values

[1, 97921, 1039585, 130402572385, 1384429704481, 173658931280825761, 1843664419471976641, 231264030011583194717761, 2455233718711319470593985, 307977546462671843639087352385, 3269669116478082433043125969441, 410138010309759307549971991199125921]

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

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