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.

A304975 Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 5 colors (sets).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 1
6 3
7 12
8 34
9 95
10 261
11 630
12 1700
13 3801
14 10143
15 21672
16 57414
17 119155
18 314121
19 639210
20 1679320
21 3370301
22 8832483
23 17549532
24 45907994
25 90541815
26 236526381
27 463889790
28 1210585740
29 2364180001
30 6164760423
31 11999840592
32 31271161774
33 60714998075
34 158145313041
35 306438236370
36 797884712960

List of values

[0, 0, 0, 0, 0, 1, 3, 12, 34, 95, 261, 630, 1700, 3801, 10143, 21672, 57414, 119155, 314121, 639210, 1679320, 3370301, 8832483, 17549532, 45907994, 90541815, 236526381, 463889790, 1210585740, 2364180001, 6164760423, 11999840592, 31271161774, 60714998075, 158145313041, 306438236370, 797884712960]

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

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