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.

A032069 Number of reversible strings with n labeled beads of 2 colors, no palindromes of more than 1 bead.

Table of values

n a(n)
1 2
2 2
3 12
4 144
5 1440
6 20160
7 282240
8 4838400
9 87091200
10 1799884800
11 39597465600
12 965667225600
13 25107347865600
14 708585150873600
15 21257554526208000
16 682919861944320000
17 23219275306106880000

List of values

[2, 2, 12, 144, 1440, 20160, 282240, 4838400, 87091200, 1799884800, 39597465600, 965667225600, 25107347865600, 708585150873600, 21257554526208000, 682919861944320000, 23219275306106880000]

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

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