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.

A045655 Number of 2n-bead balanced binary strings, rotationally equivalent to reversed complement.

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 54
5 152
6 348
7 884
8 1974
9 4556
10 10056
11 22508
12 48636
13 106472
14 228444
15 491120
16 1046454
17 2228192
18 4713252
19 9961436
20 20960904
21 44038280
22 92252100
23 192937940
24 402599676
25 838860152
26 1744723896
27 3623869388
28 7515962172

List of values

[1, 2, 6, 20, 54, 152, 348, 884, 1974, 4556, 10056, 22508, 48636, 106472, 228444, 491120, 1046454, 2228192, 4713252, 9961436, 20960904, 44038280, 92252100, 192937940, 402599676, 838860152, 1744723896, 3623869388, 7515962172]

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

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