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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.

A354303 a(n) is the denominator of Sum_{k=0..n} 1 / (k!)^2.

Table of values

n a(n)
0 1
1 1
2 4
3 18
4 576
5 2400
6 518400
7 12700800
8 541900800
9 65840947200
10 13168189440000
11 88519495680000
12 229442532802560000
13 19387894021816320000
14 2533351485517332480000
15 855006126362099712000000
16 437763136697395052544000000
17 1621968544942912438272000000

List of values

[1, 1, 4, 18, 576, 2400, 518400, 12700800, 541900800, 65840947200, 13168189440000, 88519495680000, 229442532802560000, 19387894021816320000, 2533351485517332480000, 855006126362099712000000, 437763136697395052544000000, 1621968544942912438272000000]

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

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