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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.

A385251 a(n) = Sum_{k=0..n-1} binomial(4*k-3,k) * binomial(4*n-4*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 9
3 84
4 790
5 7452
6 70401
7 665692
8 6298236
9 59612556
10 564393460
11 5344664400
12 50621130078
13 479513718116
14 4542730477758
15 43039907282664
16 407809863233592
17 3864303038901996
18 36619104142640460
19 347027703183853552
20 3288802989845088504
21 31169274939274755312

List of values

[0, 1, 9, 84, 790, 7452, 70401, 665692, 6298236, 59612556, 564393460, 5344664400, 50621130078, 479513718116, 4542730477758, 43039907282664, 407809863233592, 3864303038901996, 36619104142640460, 347027703183853552, 3288802989845088504, 31169274939274755312]

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

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