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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.

A080421 a(n) = (n+1)*(n+2)*(n+9)*3^n/18.

Table of values

n a(n)
0 1
1 10
2 66
3 360
4 1755
5 7938
6 34020
7 139968
8 557685
9 2165130
10 8227494
11 30705480
12 112842639
13 409209570
14 1466777160
15 5203870272
16 18294856425
17 63795240522
18 220829678730
19 759344158440
20 2595329855811
21 8821564534530
22 29832927334956
23 100419390748800
24 336561864306525

List of values

[1, 10, 66, 360, 1755, 7938, 34020, 139968, 557685, 2165130, 8227494, 30705480, 112842639, 409209570, 1466777160, 5203870272, 18294856425, 63795240522, 220829678730, 759344158440, 2595329855811, 8821564534530, 29832927334956, 100419390748800, 336561864306525]

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

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