cp's OEIS Frontend

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.

A117443 Expansion of e.g.f.: exp(x)/(cos(x) + sin(x)).

Table of values

n a(n)
0 1
1 0
2 2
3 -4
4 28
5 -160
6 1272
7 -11184
8 114448
9 -1309440
10 16680992
11 -233587264
12 3569157568
13 -59075960320
14 1053056675712
15 -20111857791744
16 409715696197888
17 -8868323731660800
18 203247024658514432
19 -4916860703228314624
20 125206830774036241408
21 -3347784042587048058880

List of values

[1, 0, 2, -4, 28, -160, 1272, -11184, 114448, -1309440, 16680992, -233587264, 3569157568, -59075960320, 1053056675712, -20111857791744, 409715696197888, -8868323731660800, 203247024658514432, -4916860703228314624, 125206830774036241408, -3347784042587048058880]

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

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