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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.

A234507 4*binomial(9*n+4,n)/(9*n+4).

Table of values

n a(n)
0 1
1 4
2 42
3 580
4 9139
5 155664
6 2791404
7 51919296
8 992414925
9 19375620264
10 384734333698
11 7745767624560
12 157746595917027
13 3243956787596560
14 67267249849483200
15 1404952651131292800
16 29529506061314207361
17 624113938377564174540
18 13256095235994257535900
19 282803564653982441429256
20 6057302574889055180495805

List of values

[1, 4, 42, 580, 9139, 155664, 2791404, 51919296, 992414925, 19375620264, 384734333698, 7745767624560, 157746595917027, 3243956787596560, 67267249849483200, 1404952651131292800, 29529506061314207361, 624113938377564174540, 13256095235994257535900, 282803564653982441429256, 6057302574889055180495805]

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

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