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.

A253715 Indices of centered heptagonal numbers (A069099) which are also hexagonal numbers (A000384).

Table of values

n a(n)
1 1
2 2160
3 34417
4 139317984
5 2220346081
6 8987960385360
7 143243407002961
8 579849276161764800
9 9241205157168647617
10 37408396193312133889584
11 596187109366334725327921
12 2413365271435489729590825120
13 38462415164418513312636815521
14 155695847083980788221510357869840

List of values

[1, 2160, 34417, 139317984, 2220346081, 8987960385360, 143243407002961, 579849276161764800, 9241205157168647617, 37408396193312133889584, 596187109366334725327921, 2413365271435489729590825120, 38462415164418513312636815521, 155695847083980788221510357869840]

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

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