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.

A253689 Centered triangular numbers (A005448) which are also centered heptagonal numbers (A069099).

Table of values

n a(n)
1 1
2 316
3 7246
4 3818431
5 87657571
6 46195373386
7 1060481282176
8 558871623400861
9 12829702464103141
10 6761228853708238456
11 155213739350238513106
12 81797346113290645435291
13 1877775805829483067448711
14 989584286517361374767907526
15 22717331543711346799755988036

List of values

[1, 316, 7246, 3818431, 87657571, 46195373386, 1060481282176, 558871623400861, 12829702464103141, 6761228853708238456, 155213739350238513106, 81797346113290645435291, 1877775805829483067448711, 989584286517361374767907526, 22717331543711346799755988036]

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

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