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.

A050409 Truncated square pyramid numbers: a(n) = Sum_{k = n..2*n} k^2.

Table of values

n a(n)
0 0
1 5
2 29
3 86
4 190
5 355
6 595
7 924
8 1356
9 1905
10 2585
11 3410
12 4394
13 5551
14 6895
15 8440
16 10200
17 12189
18 14421
19 16910
20 19670
21 22715
22 26059
23 29716
24 33700
25 38025
26 42705
27 47754
28 53186
29 59015
30 65255
31 71920
32 79024
33 86581
34 94605
35 103110
36 112110
37 121619

List of values

[0, 5, 29, 86, 190, 355, 595, 924, 1356, 1905, 2585, 3410, 4394, 5551, 6895, 8440, 10200, 12189, 14421, 16910, 19670, 22715, 26059, 29716, 33700, 38025, 42705, 47754, 53186, 59015, 65255, 71920, 79024, 86581, 94605, 103110, 112110, 121619]