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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.

A330518 Expansion of e.g.f. Product_{k>=1} (sec(x^k) + tan(x^k)).

Table of values

n a(n)
0 1
1 1
2 3
3 14
4 77
5 536
6 4471
7 41474
8 437737
9 5206120
10 67098091
11 944705662
12 14495605277
13 237203399044
14 4162492013135
15 78089687760842
16 1545654292223825
17 32385137447167280
18 716473190874986323
19 16611710217097325366
20 404119023609893926405

List of values

[1, 1, 3, 14, 77, 536, 4471, 41474, 437737, 5206120, 67098091, 944705662, 14495605277, 237203399044, 4162492013135, 78089687760842, 1545654292223825, 32385137447167280, 716473190874986323, 16611710217097325366, 404119023609893926405]

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

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