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.

A224543 Number of (n+1) X (n+1) 0..1 matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 8
2 32
3 78
4 196
5 428
6 916
7 1858
8 3678
9 7096
10 13458
11 25150
12 46466
13 85028
14 154356
15 278298
16 498792
17 889320
18 1578248
19 2789166
20 4910498
21 8615348
22 15067462
23 26274538
24 45693286

List of values

[8, 32, 78, 196, 428, 916, 1858, 3678, 7096, 13458, 25150, 46466, 85028, 154356, 278298, 498792, 889320, 1578248, 2789166, 4910498, 8615348, 15067462, 26274538, 45693286]