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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.

A125599 Quotient ((2n)^(2n-2)-1)/(2n+1)/(2n-1).

Table of values

n a(n)
1 0
2 1
3 37
4 4161
5 1010101
6 432988561
7 290738012181
8 282578800148737
9 375973780484811925
10 657002506265664160401
11 1460516560427337565647925
12 4026980002567282984447709761
13 13491386325240318454518243016437

List of values

[0, 1, 37, 4161, 1010101, 432988561, 290738012181, 282578800148737, 375973780484811925, 657002506265664160401, 1460516560427337565647925, 4026980002567282984447709761, 13491386325240318454518243016437]

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

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