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.

A188913 Binomial convolution of the binomial coefficients bin(3n,n) (A005809) and bin(3n,n)/(2n+1) (A001764).

Table of values

n a(n)
0 1
1 4
2 24
3 168
4 1300
5 10896
6 97734
7 928752
8 9262116
9 96091440
10 1029267888
11 11311712352
12 126921365298
13 1448378629600
14 16760687848890
15 196237061599008
16 2320532776851972
17 27676644749022672
18 332568471941572944
19 4022574792189178080

List of values

[1, 4, 24, 168, 1300, 10896, 97734, 928752, 9262116, 96091440, 1029267888, 11311712352, 126921365298, 1448378629600, 16760687848890, 196237061599008, 2320532776851972, 27676644749022672, 332568471941572944, 4022574792189178080]

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

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