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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.

A184031 1/16 the number of (n+1) X 2 0..3 arrays with all 2 X 2 subblocks having the same four values.

Table of values

n a(n)
1 16
2 28
3 49
4 91
5 169
6 325
7 625
8 1225
9 2401
10 4753
11 9409
12 18721
13 37249
14 74305
15 148225
16 296065
17 591361
18 1181953
19 2362369
20 4723201
21 9443329
22 18883585
23 37761025
24 75515905
25 151019521
26 302026753
27 604028929
28 1208033281
29 2416017409
30 4831985665

List of values

[16, 28, 49, 91, 169, 325, 625, 1225, 2401, 4753, 9409, 18721, 37249, 74305, 148225, 296065, 591361, 1181953, 2362369, 4723201, 9443329, 18883585, 37761025, 75515905, 151019521, 302026753, 604028929, 1208033281, 2416017409, 4831985665]

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

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