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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.

A263248 E.g.f.: r / sqrt(1 + cos(r*x)^2) where r = sqrt(2), even powers only.

Table of values

n a(n)
0 1
1 1
2 1
3 -71
4 -2591
5 -23759
6 7872481
7 1032165289
8 34225547329
9 -19224419375519
10 -5800472581083839
11 -474084524873544551
12 353987939065905654049
13 201460031539970745643921
14 32857189444574660214635041
15 -29238884957420392451016521591
16 -28126153570109708198511424386431
17 -8022417111018145463775521643973439
18 7957314358326789159275513256441813121

List of values

[1, 1, 1, -71, -2591, -23759, 7872481, 1032165289, 34225547329, -19224419375519, -5800472581083839, -474084524873544551, 353987939065905654049, 201460031539970745643921, 32857189444574660214635041, -29238884957420392451016521591, -28126153570109708198511424386431, -8022417111018145463775521643973439, 7957314358326789159275513256441813121]

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

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