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.

A099044 a(n) = (2*0^n + 3^n*binomial(2*n,n))/3.

Table of values

n a(n)
0 1
1 2
2 18
3 180
4 1890
5 20412
6 224532
7 2501928
8 28146690
9 318995820
10 3636552348
11 41655054168
12 479033122932
13 5527305264600
14 63958818061800
15 741922289516880
16 8624846615633730
17 100454095876204620
18 1171964451889053900
19 13693479385229998200
20 160213708807190978940

List of values

[1, 2, 18, 180, 1890, 20412, 224532, 2501928, 28146690, 318995820, 3636552348, 41655054168, 479033122932, 5527305264600, 63958818061800, 741922289516880, 8624846615633730, 100454095876204620, 1171964451889053900, 13693479385229998200, 160213708807190978940]

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

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