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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.

A366818 Let p = A000043(n) be the n-th Mersenne exponent, then a(n) = ((2^p-1)^2-1)/p.

Table of values

n a(n)
1 4
2 16
3 192
4 2304
5 5160960
6 1010565120
7 14467203072
8 148764064972013568
9 87162491526879729295140036437606400
10 4304762755241260838085244444377946703587691074682880
11 246056756234946697892331840382404519263272106760845744463151104
12 227937183538024006739312962615527377661237903932985846822055286571232395264

List of values

[4, 16, 192, 2304, 5160960, 1010565120, 14467203072, 148764064972013568, 87162491526879729295140036437606400, 4304762755241260838085244444377946703587691074682880, 246056756234946697892331840382404519263272106760845744463151104, 227937183538024006739312962615527377661237903932985846822055286571232395264]

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

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