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.

A224671 Number of (n+1) X 4 0..2 matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 41
2 76
3 108
4 170
5 257
6 398
7 617
8 967
9 1525
10 2421
11 3862
12 6185
13 9934
14 15990
15 25778
16 41604
17 67199
18 108600
19 175575
20 283929
21 459235
22 742871
23 1201788
24 1944315
25 3145732
26 5089648
27 8234952
28 13324142
29 21558605
30 34882226
31 56440277
32 91321915
33 147761569

List of values

[41, 76, 108, 170, 257, 398, 617, 967, 1525, 2421, 3862, 6185, 9934, 15990, 25778, 41604, 67199, 108600, 175575, 283929, 459235, 742871, 1201788, 1944315, 3145732, 5089648, 8234952, 13324142, 21558605, 34882226, 56440277, 91321915, 147761569]