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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.

A320524 Number of chiral pairs of a row of n colors using 6 or fewer colors.

Table of values

n a(n)
1 0
2 15
3 90
4 630
5 3780
6 23220
7 139320
8 839160
9 5034960
10 30229200
11 181375200
12 1088367840
13 6530207040
14 39181942080
15 235091652480
16 1410554113920
17 8463324683520
18 50779973295360
19 304679839772160
20 1828079189798400
21 10968475138790400
22 65810851739735040
23 394865110438410240
24 2369190668072417280
25 14215144008434503680
26 85290864083258757120

List of values

[0, 15, 90, 630, 3780, 23220, 139320, 839160, 5034960, 30229200, 181375200, 1088367840, 6530207040, 39181942080, 235091652480, 1410554113920, 8463324683520, 50779973295360, 304679839772160, 1828079189798400, 10968475138790400, 65810851739735040, 394865110438410240, 2369190668072417280, 14215144008434503680, 85290864083258757120]

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

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