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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.

A004988 a(n) = (3^n/n!) * Product_{k=0..n-1} (3*k + 2).

Table of values

n a(n)
0 1
1 6
2 45
3 360
4 2970
5 24948
6 212058
7 1817640
8 15677145
9 135868590
10 1182056733
11 10316131488
12 90266150520
13 791564704560
14 6954461332920
15 61199259729696
16 539318476367946
17 4758692438540700
18 42035116540442850
19 371678925199705200
20 3289358488017391020

List of values

[1, 6, 45, 360, 2970, 24948, 212058, 1817640, 15677145, 135868590, 1182056733, 10316131488, 90266150520, 791564704560, 6954461332920, 61199259729696, 539318476367946, 4758692438540700, 42035116540442850, 371678925199705200, 3289358488017391020]

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

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