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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.

A184891 a(n) = (5^n/n!^2) * Product_{k=0..n-1} (10k+1)*(10k+4).

Table of values

n a(n)
0 1
1 20
2 3850
3 1078000
4 355066250
5 128107903000
6 49001272897500
7 19520507080800000
8 8012558140822125000
9 3365274419145292500000
10 1439327869068441602250000
11 624739666805574817770000000

List of values

[1, 20, 3850, 1078000, 355066250, 128107903000, 49001272897500, 19520507080800000, 8012558140822125000, 3365274419145292500000, 1439327869068441602250000, 624739666805574817770000000]

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

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