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.

A184041 1/9 the number of (n+1) X 3 0..2 arrays with all 2 X 2 subblocks having the same four values.

Table of values

n a(n)
1 15
2 21
3 31
4 51
5 87
6 159
7 295
8 567
9 1095
10 2151
11 4231
12 8391
13 16647
14 33159
15 66055
16 131847
17 263175
18 525831
19 1050631
20 2100231
21 4198407
22 8394759
23 16785415
24 33566727
25 67125255
26 134242311
27 268468231
28 536920071
29 1073807367
30 2147581959
31 4295098375

List of values

[15, 21, 31, 51, 87, 159, 295, 567, 1095, 2151, 4231, 8391, 16647, 33159, 66055, 131847, 263175, 525831, 1050631, 2100231, 4198407, 8394759, 16785415, 33566727, 67125255, 134242311, 268468231, 536920071, 1073807367, 2147581959, 4295098375]

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

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