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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.

A215541 a(n) = binomial(5*n,n)*(3*n+1)/(4*n+1).

Table of values

n a(n)
0 1
1 4
2 35
3 350
4 3705
5 40480
6 451269
7 5101360
8 58261125
9 670609940
10 7766844470
11 90404916420
12 1056658719675
13 12393263030400
14 145787921878840
15 1719353829326880
16 20322351313767965
17 240674861588534100
18 2855214354095519625
19 33924757188414045330
20 403641797464597415570

List of values

[1, 4, 35, 350, 3705, 40480, 451269, 5101360, 58261125, 670609940, 7766844470, 90404916420, 1056658719675, 12393263030400, 145787921878840, 1719353829326880, 20322351313767965, 240674861588534100, 2855214354095519625, 33924757188414045330, 403641797464597415570]

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

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