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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.

A354401 a(n) is the denominator of Sum_{k=1..n} 1 / (k*k!).

Table of values

n a(n)
1 1
2 4
3 36
4 288
5 7200
6 10800
7 66150
8 33868800
9 914457600
10 4572288000
11 553246848000
12 737662464000
13 41554985472000
14 54540918432000
15 19634730635520000
16 5026491042693120000
17 1452655911338311680000
18 39221709606134415360000
19 14159037167814523944960000
20 141590371678145239449600000

List of values

[1, 4, 36, 288, 7200, 10800, 66150, 33868800, 914457600, 4572288000, 553246848000, 737662464000, 41554985472000, 54540918432000, 19634730635520000, 5026491042693120000, 1452655911338311680000, 39221709606134415360000, 14159037167814523944960000, 141590371678145239449600000]

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

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