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.

A240798 Total number of occurrences of the pattern 1=2=3 in all preferential arrangements (or ordered partitions) of n elements.

Table of values

n a(n)
1 0
2 0
3 1
4 12
5 130
6 1500
7 18935
8 262248
9 3972612
10 65500200
11 1169398065
12 22494463860
13 464072915878
14 10225330604580
15 239720548513355
16 5959152063448080
17 156592569864940040
18 4337574220496785680
19 126329273251232688069
20 3859509516112803668220
21 123426111134706786806890

List of values

[0, 0, 1, 12, 130, 1500, 18935, 262248, 3972612, 65500200, 1169398065, 22494463860, 464072915878, 10225330604580, 239720548513355, 5959152063448080, 156592569864940040, 4337574220496785680, 126329273251232688069, 3859509516112803668220, 123426111134706786806890]

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

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