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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.

A354335 a(n) is the denominator of Sum_{k=0..n} 1 / (2*k)!.

Table of values

n a(n)
0 1
1 2
2 24
3 720
4 4480
5 518400
6 479001600
7 29059430400
8 20922789888000
9 6402373705728000
10 810967336058880000
11 1124000727777607680000
12 88635485961891348480000
13 14936720782466875392000000
14 27717122237428532772864000000
15 265252859812191058636308480000000

List of values

[1, 2, 24, 720, 4480, 518400, 479001600, 29059430400, 20922789888000, 6402373705728000, 810967336058880000, 1124000727777607680000, 88635485961891348480000, 14936720782466875392000000, 27717122237428532772864000000, 265252859812191058636308480000000]

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

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