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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.

A354333 a(n) is the denominator of Sum_{k=0..n} (-1)^k / (2*k+1)!.

Table of values

n a(n)
0 1
1 6
2 120
3 5040
4 362880
5 39916800
6 249080832
7 1307674368000
8 27360571392000
9 121645100408832000
10 51090942171709440000
11 5170403347776995328000
12 15511210043330985984000000
13 10888869450418352160768000000
14 8841761993739701954543616000000
15 432780981798838043038187520000000

List of values

[1, 6, 120, 5040, 362880, 39916800, 249080832, 1307674368000, 27360571392000, 121645100408832000, 51090942171709440000, 5170403347776995328000, 15511210043330985984000000, 10888869450418352160768000000, 8841761993739701954543616000000, 432780981798838043038187520000000]

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

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