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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.

A305539 a(n) is a generalized pentagonal number such that 2*a(n) is also a generalized pentagonal number.

Table of values

n a(n)
1 0
2 1
3 35
4 1190
5 40426
6 1373295
7 46651605
8 1584781276
9 53835911780
10 1828836219245
11 62126595542551
12 2110475412227490
13 71694037420192110
14 2435486796874304251
15 82734857056306152425
16 2810549653117534878200
17 95475953348939879706376
18 3243371864210838375138585

List of values

[0, 1, 35, 1190, 40426, 1373295, 46651605, 1584781276, 53835911780, 1828836219245, 62126595542551, 2110475412227490, 71694037420192110, 2435486796874304251, 82734857056306152425, 2810549653117534878200, 95475953348939879706376, 3243371864210838375138585]

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

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