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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.

A240721 Expansion of -(4*x + sqrt(1-8*x) - 1)/(sqrt(1-8*x)*(4*x^2+x) + 8*x^2 - x).

Table of values

n a(n)
0 1
1 7
2 49
3 351
4 2561
5 18943
6 141569
7 1066495
8 8085505
9 61616127
10 471556097
11 3621830655
12 27902803969
13 215530668031
14 1668644405249
15 12944666918911
16 100598145875969
17 783027553697791
18 6103529011806209
19 47636654222999551
20 372225072921837569
21 2911581699143892991

List of values

[1, 7, 49, 351, 2561, 18943, 141569, 1066495, 8085505, 61616127, 471556097, 3621830655, 27902803969, 215530668031, 1668644405249, 12944666918911, 100598145875969, 783027553697791, 6103529011806209, 47636654222999551, 372225072921837569, 2911581699143892991]

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

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