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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.

A354378 a(n) is the denominator of Sum_{k=0..n} (-1)^k / (2*k)!.

Table of values

n a(n)
0 1
1 2
2 24
3 720
4 8064
5 3628800
6 479001600
7 87178291200
8 20922789888000
9 1280474741145600
10 2432902008176640000
11 1124000727777607680000
12 620448401733239439360000
13 403291461126605635584000000
14 60977668922342772100300800000
15 1569543549184562477137920000000

List of values

[1, 2, 24, 720, 8064, 3628800, 479001600, 87178291200, 20922789888000, 1280474741145600, 2432902008176640000, 1124000727777607680000, 620448401733239439360000, 403291461126605635584000000, 60977668922342772100300800000, 1569543549184562477137920000000]

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

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