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.

A287057 a(n) = 2*n^2 + n - (n+1) mod 2.

Table of values

n a(n)
1 3
2 9
3 21
4 35
5 55
6 77
7 105
8 135
9 171
10 209
11 253
12 299
13 351
14 405
15 465
16 527
17 595
18 665
19 741
20 819
21 903
22 989
23 1081
24 1175
25 1275
26 1377
27 1485
28 1595
29 1711
30 1829
31 1953
32 2079
33 2211
34 2345
35 2485
36 2627
37 2775
38 2925
39 3081
40 3239
41 3403
42 3569
43 3741
44 3915
45 4095

List of values

[3, 9, 21, 35, 55, 77, 105, 135, 171, 209, 253, 299, 351, 405, 465, 527, 595, 665, 741, 819, 903, 989, 1081, 1175, 1275, 1377, 1485, 1595, 1711, 1829, 1953, 2079, 2211, 2345, 2485, 2627, 2775, 2925, 3081, 3239, 3403, 3569, 3741, 3915, 4095]

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

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