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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.

A024489 a(n) = (1/(9n-3))*M(3n; n,n,n), where M() is a multinomial coefficient.

Table of values

n a(n)
1 1
2 6
3 70
4 1050
5 18018
6 336336
7 6651216
8 137181330
9 2921454250
10 63804560820
11 1422156202740
12 32235540595440
13 741035948007600
14 17240428178136000
15 405264998374050240
16 9612379180184504130
17 229799057978874529530
18 5532199543935868303500
19 134014085905039247407500

List of values

[1, 6, 70, 1050, 18018, 336336, 6651216, 137181330, 2921454250, 63804560820, 1422156202740, 32235540595440, 741035948007600, 17240428178136000, 405264998374050240, 9612379180184504130, 229799057978874529530, 5532199543935868303500, 134014085905039247407500]

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

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