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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.

A224666 Number of 4 X 4 0..n matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 78
2 108
3 142
4 180
5 222
6 268
7 318
8 372
9 430
10 492
11 558
12 628
13 702
14 780
15 862
16 948
17 1038
18 1132
19 1230
20 1332
21 1438
22 1548
23 1662
24 1780
25 1902
26 2028
27 2158
28 2292
29 2430
30 2572
31 2718
32 2868
33 3022
34 3180
35 3342
36 3508
37 3678
38 3852
39 4030
40 4212
41 4398
42 4588
43 4782
44 4980
45 5182

List of values

[78, 108, 142, 180, 222, 268, 318, 372, 430, 492, 558, 628, 702, 780, 862, 948, 1038, 1132, 1230, 1332, 1438, 1548, 1662, 1780, 1902, 2028, 2158, 2292, 2430, 2572, 2718, 2868, 3022, 3180, 3342, 3508, 3678, 3852, 4030, 4212, 4398, 4588, 4782, 4980, 5182]

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

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