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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.

A386615 a(n) = Sum_{k=0..n-1} binomial(6*k,k) * binomial(6*n-6*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 18
3 291
4 4550
5 70065
6 1069872
7 16251694
8 246010014
9 3714826350
10 55993450830
11 842823848448
12 12672667549488
13 190381643518855
14 2858101359683400
15 42882348756992220
16 643085584745669134
17 9640075656634321770
18 144457232389535563980
19 2164044325920832653825
20 32409930873969839549610

List of values

[0, 1, 18, 291, 4550, 70065, 1069872, 16251694, 246010014, 3714826350, 55993450830, 842823848448, 12672667549488, 190381643518855, 2858101359683400, 42882348756992220, 643085584745669134, 9640075656634321770, 144457232389535563980, 2164044325920832653825, 32409930873969839549610]

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

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