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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.

A251963 Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to an octagonal number N(m) for some m.

Table of values

n a(n)
1 0
2 14
3 208
4 2910
5 40544
6 564718
7 7865520
8 109552574
9 1525870528
10 21252634830
11 296011017104
12 4122901604638
13 57424611447840
14 799821658665134
15 11140078609864048
16 155161278879431550
17 2161117825702177664
18 30100488280951055758
19 419245718107612602960

List of values

[0, 14, 208, 2910, 40544, 564718, 7865520, 109552574, 1525870528, 21252634830, 296011017104, 4122901604638, 57424611447840, 799821658665134, 11140078609864048, 155161278879431550, 2161117825702177664, 30100488280951055758, 419245718107612602960]

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

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