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.

A117719 a(2n) = A001653(n) (Numbers n such that 2*n^2 - 1 is a square), a(2n+1) = A038725(n+1).

Table of values

n a(n)
0 1
1 2
2 5
3 11
4 29
5 64
6 169
7 373
8 985
9 2174
10 5741
11 12671
12 33461
13 73852
14 195025
15 430441
16 1136689
17 2508794
18 6625109
19 14622323
20 38613965
21 85225144
22 225058681
23 496728541
24 1311738121
25 2895146102
26 7645370045
27 16874148071
28 44560482149

List of values

[1, 2, 5, 11, 29, 64, 169, 373, 985, 2174, 5741, 12671, 33461, 73852, 195025, 430441, 1136689, 2508794, 6625109, 14622323, 38613965, 85225144, 225058681, 496728541, 1311738121, 2895146102, 7645370045, 16874148071, 44560482149]

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

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