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.

A224670 Number of (n+1) X 3 0..2 matrices with each 2 X 2 subblock idempotent.

Table of values

n a(n)
1 25
2 50
3 76
4 123
5 191
6 300
7 470
8 741
9 1173
10 1866
11 2980
12 4775
13 7671
14 12348
15 19906
16 32125
17 51885
18 83846
19 135548
20 219191
21 354515
22 573460
23 927706
24 1500873
25 2428261
26 3928790
27 6356680
28 10285071
29 16641323
30 26925936
31 43566770
32 70492185
33 114058401

List of values

[25, 50, 76, 123, 191, 300, 470, 741, 1173, 1866, 2980, 4775, 7671, 12348, 19906, 32125, 51885, 83846, 135548, 219191, 354515, 573460, 927706, 1500873, 2428261, 3928790, 6356680, 10285071, 16641323, 26925936, 43566770, 70492185, 114058401]

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

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