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.

A187746 G.f.: Sum_{n>=0} (2*n+x)^n * x^n / (1 + 2*n*x + x^2)^n.

Table of values

n a(n)
0 1
1 2
2 13
3 100
4 984
5 11712
6 163200
7 2603520
8 46771200
9 934133760
10 20530298880
11 492355584000
12 12793813401600
13 358063276032000
14 10737974299852800
15 343513154086502400
16 11676590580695040000
17 420271561157640192000
18 15967576932074127360000

List of values

[1, 2, 13, 100, 984, 11712, 163200, 2603520, 46771200, 934133760, 20530298880, 492355584000, 12793813401600, 358063276032000, 10737974299852800, 343513154086502400, 11676590580695040000, 420271561157640192000, 15967576932074127360000]