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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.

A368838 a(n) = n! * (n+3)! * Sum_{k=0..n} 1/(k! * (k+3)!).

Table of values

n a(n)
0 1
1 5
2 51
3 919
4 25733
5 1029321
6 55583335
7 3890833451
8 342393343689
9 36978481118413
10 4807202545393691
11 740309191990628415
12 133255654558313114701
13 27717176148129127857809
14 6596687923254732430158543
15 1781105739278777756142806611
16 541456144740748437867413209745

List of values

[1, 5, 51, 919, 25733, 1029321, 55583335, 3890833451, 342393343689, 36978481118413, 4807202545393691, 740309191990628415, 133255654558313114701, 27717176148129127857809, 6596687923254732430158543, 1781105739278777756142806611, 541456144740748437867413209745]

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

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