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.

A137930 The sum of the principal diagonals of an n X n spiral.

Table of values

n a(n)
0 0
1 1
2 10
3 25
4 56
5 101
6 170
7 261
8 384
9 537
10 730
11 961
12 1240
13 1565
14 1946
15 2381
16 2880
17 3441
18 4074
19 4777
20 5560
21 6421
22 7370
23 8405
24 9536
25 10761
26 12090
27 13521
28 15064
29 16717
30 18490
31 20381
32 22400
33 24545
34 26826
35 29241
36 31800
37 34501
38 37354
39 40357
40 43520
41 46841
42 50330

List of values

[0, 1, 10, 25, 56, 101, 170, 261, 384, 537, 730, 961, 1240, 1565, 1946, 2381, 2880, 3441, 4074, 4777, 5560, 6421, 7370, 8405, 9536, 10761, 12090, 13521, 15064, 16717, 18490, 20381, 22400, 24545, 26826, 29241, 31800, 34501, 37354, 40357, 43520, 46841, 50330]