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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.

A295518 a(n) = e^2 * Sum_{k=0..n-1} Gamma(k + 1, 2).

Table of values

n a(n)
0 0
1 1
2 4
3 14
4 52
5 220
6 1092
7 6388
8 43588
9 341444
10 3022660
11 29835844
12 324782916
13 3864151876
14 49875956548
15 694041238340
16 10356520497988
17 164956188717892
18 2793150548587332
19 50100649026499396
20 948943120107352900
21 18925792541725471556
22 396439630395708060484

List of values

[0, 1, 4, 14, 52, 220, 1092, 6388, 43588, 341444, 3022660, 29835844, 324782916, 3864151876, 49875956548, 694041238340, 10356520497988, 164956188717892, 2793150548587332, 50100649026499396, 948943120107352900, 18925792541725471556, 396439630395708060484]

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

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