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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.

A298244 a(n) = n! * [x^n] (sec(x) + tan(x))^n.

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 320
5 4400
6 74016
7 1472240
8 33800192
9 879646464
10 25589632000
11 822867814912
12 28982612385792
13 1109640105852928
14 45884917741981696
15 2038015221365667840
16 96765606087737999360
17 4890992991269273403392
18 262201755871367895711744
19 14859866059895961631981568
20 887693530413229611155456000

List of values

[1, 1, 4, 30, 320, 4400, 74016, 1472240, 33800192, 879646464, 25589632000, 822867814912, 28982612385792, 1109640105852928, 45884917741981696, 2038015221365667840, 96765606087737999360, 4890992991269273403392, 262201755871367895711744, 14859866059895961631981568, 887693530413229611155456000]

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

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