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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.

A009080 Expansion of e.g.f. cos(x*tan(x)), even terms only.

Table of values

n a(n)
0 1
1 0
2 -12
3 -240
4 -5936
5 -155520
6 -65472
7 981903104
8 223580862720
9 46255608778752
10 10060678641587200
11 2368138744630923264
12 601490101481648443392
13 161192778898870464512000
14 43208403753541588946141184

List of values

[1, 0, -12, -240, -5936, -155520, -65472, 981903104, 223580862720, 46255608778752, 10060678641587200, 2368138744630923264, 601490101481648443392, 161192778898870464512000, 43208403753541588946141184]

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

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