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.

A253826 Indices of centered octagonal numbers (A016754) which are also triangular numbers (A000217).

Table of values

n a(n)
1 1
2 18
3 595
4 20196
5 686053
6 23305590
7 791703991
8 26894630088
9 913625718985
10 31036379815386
11 1054323288004123
12 35815955412324780
13 1216688160731038381
14 41331581509442980158
15 1404057083160330286975
16 47696609245941786776976
17 1620280657278860420130193

List of values

[1, 18, 595, 20196, 686053, 23305590, 791703991, 26894630088, 913625718985, 31036379815386, 1054323288004123, 35815955412324780, 1216688160731038381, 41331581509442980158, 1404057083160330286975, 47696609245941786776976, 1620280657278860420130193]

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

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