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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.

A386614 a(n) = Sum_{k=0..n-1} binomial(5*k+1,k) * binomial(5*n-5*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 16
3 220
4 2880
5 36850
6 465536
7 5834852
8 72744640
9 903525715
10 11191199200
11 138323478980
12 1706860996096
13 21034268215120
14 258934785258240
15 3184696786012500
16 39140208951032960
17 480734044749851305
18 5901368553964031600
19 72410017973538837880
20 888114187330722044800
21 10888921795007470528060

List of values

[0, 1, 16, 220, 2880, 36850, 465536, 5834852, 72744640, 903525715, 11191199200, 138323478980, 1706860996096, 21034268215120, 258934785258240, 3184696786012500, 39140208951032960, 480734044749851305, 5901368553964031600, 72410017973538837880, 888114187330722044800, 10888921795007470528060]

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

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