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.

A309845 Expansion of e.g.f.: sec(x) + 2*tan(x).

Table of values

n a(n)
0 1
1 2
2 1
3 4
4 5
5 32
6 61
7 544
8 1385
9 15872
10 50521
11 707584
12 2702765
13 44736512
14 199360981
15 3807514624
16 19391512145
17 419730685952
18 2404879675441
19 58177770225664
20 370371188237525
21 9902996106248192
22 69348874393137901
23 2030847773013704704
24 15514534163557086905
25 493842960380415967232

List of values

[1, 2, 1, 4, 5, 32, 61, 544, 1385, 15872, 50521, 707584, 2702765, 44736512, 199360981, 3807514624, 19391512145, 419730685952, 2404879675441, 58177770225664, 370371188237525, 9902996106248192, 69348874393137901, 2030847773013704704, 15514534163557086905, 493842960380415967232]

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

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