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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.

A158493 a(n) = 20*n^2 + 1.

Table of values

n a(n)
0 1
1 21
2 81
3 181
4 321
5 501
6 721
7 981
8 1281
9 1621
10 2001
11 2421
12 2881
13 3381
14 3921
15 4501
16 5121
17 5781
18 6481
19 7221
20 8001
21 8821
22 9681
23 10581
24 11521
25 12501
26 13521
27 14581
28 15681
29 16821
30 18001
31 19221
32 20481
33 21781
34 23121
35 24501
36 25921
37 27381
38 28881
39 30421
40 32001
41 33621
42 35281

List of values

[1, 21, 81, 181, 321, 501, 721, 981, 1281, 1621, 2001, 2421, 2881, 3381, 3921, 4501, 5121, 5781, 6481, 7221, 8001, 8821, 9681, 10581, 11521, 12501, 13521, 14581, 15681, 16821, 18001, 19221, 20481, 21781, 23121, 24501, 25921, 27381, 28881, 30421, 32001, 33621, 35281]

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

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