cp's OEIS Frontend

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.

A255952 Number of collections of nonempty multisets with a total of n+2 objects of exactly n colors.

Table of values

n a(n)
0 0
1 3
2 23
3 141
4 848
5 5190
6 32835
7 216006
8 1480524
9 10574613
10 78652940
11 608539283
12 4891327374
13 40788987473
14 352412667201
15 3150522213345
16 29106469066976
17 277557448176080
18 2728859399410797
19 27631899836521084
20 287875667322386270
21 3082851976122478749

List of values

[0, 3, 23, 141, 848, 5190, 32835, 216006, 1480524, 10574613, 78652940, 608539283, 4891327374, 40788987473, 352412667201, 3150522213345, 29106469066976, 277557448176080, 2728859399410797, 27631899836521084, 287875667322386270, 3082851976122478749]

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

Content is available under The OEIS End-User License Agreement.