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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.

A368768 a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * binomial(k+3,4) / k!).

Table of values

n a(n)
0 1
1 0
2 5
3 0
4 35
5 105
6 756
7 5082
8 40986
9 368379
10 3684505
11 40528554
12 486344013
13 6322470349
14 88514587266
15 1327718805930
16 21243500898756
17 361139515274007
18 6500511274938111
19 123509714223816794
20 2470194284476344735
21 51874079974003228809
22 1141229759428071046448

List of values

[1, 0, 5, 0, 35, 105, 756, 5082, 40986, 368379, 3684505, 40528554, 486344013, 6322470349, 88514587266, 1327718805930, 21243500898756, 361139515274007, 6500511274938111, 123509714223816794, 2470194284476344735, 51874079974003228809, 1141229759428071046448]

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

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