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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.

A306336 Expansion of e.g.f. sec(log(1 + x)) + tan(log(1 + x)).

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 -2
5 10
6 -50
7 320
8 -2340
9 19640
10 -184900
11 1932500
12 -22187200
13 277576000
14 -3757884000
15 54732418000
16 -853278998000
17 14176686784000
18 -250046057846000
19 4665989766386000
20 -91838330641200000
21 1901405069222360000
22 -41307212202493120000
23 939523370329035440000
24 -22327292561388519640000

List of values

[1, 1, 0, 1, -2, 10, -50, 320, -2340, 19640, -184900, 1932500, -22187200, 277576000, -3757884000, 54732418000, -853278998000, 14176686784000, -250046057846000, 4665989766386000, -91838330641200000, 1901405069222360000, -41307212202493120000, 939523370329035440000, -22327292561388519640000]

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

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