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.

A045664 Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reversed complement.

Table of values

n a(n)
0 1
1 2
2 4
3 18
4 48
5 150
6 324
7 882
8 1920
9 4536
10 9900
11 22506
12 48240
13 106470
14 227556
15 490950
16 1044480
17 2228190
18 4708368
19 9961434
20 20950800
21 44037378
22 92229588
23 192937938
24 402549120
25 838860000
26 1744617420
27 3623864832
28 7515733680

List of values

[1, 2, 4, 18, 48, 150, 324, 882, 1920, 4536, 9900, 22506, 48240, 106470, 227556, 490950, 1044480, 2228190, 4708368, 9961434, 20950800, 44037378, 92229588, 192937938, 402549120, 838860000, 1744617420, 3623864832, 7515733680]

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

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