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.

A222716 Numbers which are both the sum of n+1 consecutive triangular numbers and the sum of the n-1 immediately following triangular numbers.

Table of values

n a(n)
1 0
2 10
3 100
4 460
5 1460
6 3710
7 8120
8 15960
9 28920
10 49170
11 79420
12 122980
13 183820
14 266630
15 376880
16 520880
17 705840
18 939930
19 1232340
20 1593340
21 2034340
22 2567950
23 3208040
24 3969800
25 4869800
26 5926050
27 7158060
28 8586900
29 10235260
30 12127510
31 14289760
32 16749920
33 19537760
34 22684970
35 26225220
36 30194220
37 34629780
38 39571870
39 45062680
40 51146680

List of values

[0, 10, 100, 460, 1460, 3710, 8120, 15960, 28920, 49170, 79420, 122980, 183820, 266630, 376880, 520880, 705840, 939930, 1232340, 1593340, 2034340, 2567950, 3208040, 3969800, 4869800, 5926050, 7158060, 8586900, 10235260, 12127510, 14289760, 16749920, 19537760, 22684970, 26225220, 30194220, 34629780, 39571870, 45062680, 51146680]

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

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