cp's OEIS Frontend

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.

A346405 a(n) = (n!)^2 * Sum_{k=0..n-1} 1 / ((n-k)^2 * k!).

Table of values

n a(n)
0 0
1 1
2 5
3 31
4 268
5 3476
6 70656
7 2202432
8 98622336
9 5954736384
10 463100042880
11 44924476970880
12 5308404719823360
13 749930460864929280
14 124754522068412651520
15 24129984694192721971200
16 5368254991077002482483200
17 1360938718277588430567014400
18 389980903967231535140578099200

List of values

[0, 1, 5, 31, 268, 3476, 70656, 2202432, 98622336, 5954736384, 463100042880, 44924476970880, 5308404719823360, 749930460864929280, 124754522068412651520, 24129984694192721971200, 5368254991077002482483200, 1360938718277588430567014400, 389980903967231535140578099200]

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

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