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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.

A128542 a(n) = ((2n)^(2n) - 1)/((2n+1)*(2n-1)).

Table of values

n a(n)
0 0
1 1
2 17
3 1333
4 266305
5 101010101
6 62350352785
7 56984650387477
8 72340172838076673
9 121815504877079063701
10 262801002506265664160401
11 706890015246831381773595701
12 2319540481478754999041880822337
13 9120177155862455275254332279111413

List of values

[0, 1, 17, 1333, 266305, 101010101, 62350352785, 56984650387477, 72340172838076673, 121815504877079063701, 262801002506265664160401, 706890015246831381773595701, 2319540481478754999041880822337, 9120177155862455275254332279111413]

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

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