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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.

A309209 Continued fraction expansion of the negation of the constant defined by A265011 (among other formulas, this is Sum_{k >= 1} arctan((-1)^k/k)).

Table of values

n a(n)
0 -1
1 2
2 36
3 1
4 40
5 1
6 94
7 1
8 1

List of values

[-1, 2, 36, 1, 40, 1, 94, 1, 1]

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