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.

A224672 Number of (n+1) X 5 0..2 matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 70
2 123
3 170
4 260
5 381
6 573
7 864
8 1322
9 2043
10 3191
11 5026
12 7972
13 12713
14 20357
15 32696
16 52630
17 84851
18 136951
19 221214
20 357516
21 578017
22 934753
23 1511920
24 2445750
25 3956671
26 6401343
27 10356854
28 16756952
29 27112473
30 43868001
31 70978956
32 114845342

List of values

[70, 123, 170, 260, 381, 573, 864, 1322, 2043, 3191, 5026, 7972, 12713, 20357, 32696, 52630, 84851, 136951, 221214, 357516, 578017, 934753, 1511920, 2445750, 3956671, 6401343, 10356854, 16756952, 27112473, 43868001, 70978956, 114845342]