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.

A224545 Number of (n+1) X 4 0..1 matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 28
2 52
3 78
4 125
5 193
6 302
7 472
8 743
9 1175
10 1868
11 2982
12 4777
13 7673
14 12350
15 19908
16 32127
17 51887
18 83848
19 135550
20 219193
21 354517
22 573462
23 927708
24 1500875
25 2428263
26 3928792
27 6356682
28 10285073
29 16641325
30 26925938
31 43566772
32 70492187
33 114058403

List of values

[28, 52, 78, 125, 193, 302, 472, 743, 1175, 1868, 2982, 4777, 7673, 12350, 19908, 32127, 51887, 83848, 135550, 219193, 354517, 573462, 927708, 1500875, 2428263, 3928792, 6356682, 10285073, 16641325, 26925938, 43566772, 70492187, 114058403]