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.

A135507 a(1) = 1; for n > 1, a(n) = 2*a(n-1) + lcm(a(n-1),n).

Table of values

n a(n)
1 1
2 4
3 20
4 60
5 180
6 540
7 4860
8 19440
9 58320
10 174960
11 2274480
12 6823440
13 20470320
14 184232880
15 552698640
16 1658095920
17 31503822480
18 94511467440
19 283534402320
20 850603206960
21 7655428862640
22 99520575214320
23 2488014380358000

List of values

[1, 4, 20, 60, 180, 540, 4860, 19440, 58320, 174960, 2274480, 6823440, 20470320, 184232880, 552698640, 1658095920, 31503822480, 94511467440, 283534402320, 850603206960, 7655428862640, 99520575214320, 2488014380358000]

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

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