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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.

A368762 a(n) = n! * (1 + Sum_{k=0..n} binomial(k+1,2) / k!).

Table of values

n a(n)
0 1
1 2
2 7
3 27
4 118
5 605
6 3651
7 25585
8 204716
9 1842489
10 18424945
11 202674461
12 2432093610
13 31617217021
14 442641038399
15 6639615576105
16 106233849217816
17 1805975436703025
18 32507557860654621
19 617643599352437989
20 12352871987048759990
21 259410311728023960021

List of values

[1, 2, 7, 27, 118, 605, 3651, 25585, 204716, 1842489, 18424945, 202674461, 2432093610, 31617217021, 442641038399, 6639615576105, 106233849217816, 1805975436703025, 32507557860654621, 617643599352437989, 12352871987048759990, 259410311728023960021]

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

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