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.

A253673 Indices of centered triangular numbers (A005448) that are also centered octagonal numbers (A016754).

Table of values

n a(n)
1 1
2 16
3 65
4 1520
5 6321
6 148896
7 619345
8 14590240
9 60689441
10 1429694576
11 5946945825
12 140095478160
13 582740001361
14 13727927165056
15 57102573187505
16 1345196766697280
17 5595469432374081
18 131815555209168336
19 548298901799472385
20 12916579213731799600

List of values

[1, 16, 65, 1520, 6321, 148896, 619345, 14590240, 60689441, 1429694576, 5946945825, 140095478160, 582740001361, 13727927165056, 57102573187505, 1345196766697280, 5595469432374081, 131815555209168336, 548298901799472385, 12916579213731799600]

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

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