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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.

A346411 a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k) * k!)^2.

Table of values

n a(n)
0 0
1 1
2 -3
3 4
4 -8
5 1
6 353
7 27224
8 1871840
9 147012849
10 13684928021
11 1514370713340
12 197964773810648
13 30300949591876913
14 5380510834911767033
15 1098630080602791984784
16 255851291397441057781120
17 67450889282916741495608737
18 19994198644782014829579657837
19 6623096362909598587714211804212

List of values

[0, 1, -3, 4, -8, 1, 353, 27224, 1871840, 147012849, 13684928021, 1514370713340, 197964773810648, 30300949591876913, 5380510834911767033, 1098630080602791984784, 255851291397441057781120, 67450889282916741495608737, 19994198644782014829579657837, 6623096362909598587714211804212]

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

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