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.

A086462 Expansion of (1+x)(1+4x)/((1-x)(1-4x)).

Table of values

n a(n)
0 1
1 10
2 50
3 210
4 850
5 3410
6 13650
7 54610
8 218450
9 873810
10 3495250
11 13981010
12 55924050
13 223696210
14 894784850
15 3579139410
16 14316557650
17 57266230610
18 229064922450
19 916259689810
20 3665038759250
21 14660155037010
22 58640620148050

List of values

[1, 10, 50, 210, 850, 3410, 13650, 54610, 218450, 873810, 3495250, 13981010, 55924050, 223696210, 894784850, 3579139410, 14316557650, 57266230610, 229064922450, 916259689810, 3665038759250, 14660155037010, 58640620148050]

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

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