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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.

A381845 a(n) = denominator( (e/Pi)*Integral_{x=-oo..+oo} cos(x)/(1 + x^2)^n dx ).

Table of values

n a(n)
1 1
2 1
3 8
4 48
5 192
6 3840
7 46080
8 322560
9 10321920
10 26542080
11 1857945600
12 11678515200
13 1961990553600
14 25505877196800
15 1428329123020800
16 42849873690624000
17 8903869857792000
18 46620662575398912000
19 2634762720116736000
20 31888533201572855808000
21 196237127394294497280000

List of values

[1, 1, 8, 48, 192, 3840, 46080, 322560, 10321920, 26542080, 1857945600, 11678515200, 1961990553600, 25505877196800, 1428329123020800, 42849873690624000, 8903869857792000, 46620662575398912000, 2634762720116736000, 31888533201572855808000, 196237127394294497280000]

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

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