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.

A269713 Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 20", based on the 5-celled von Neumann neighborhood.

Table of values

n a(n)
0 1
1 5
2 13
3 25
4 45
5 69
6 113
7 141
8 193
9 249
10 353
11 409
12 513
13 625
14 837
15 897
16 1013
17 1133
18 1365
19 1485
20 1717
21 1957
22 2421
23 2541
24 2773
25 3013
26 3477
27 3717
28 4181
29 4661
30 5593
31 5717
32 5961
33 6209
34 6697
35 6945
36 7433
37 7929
38 8905
39 9153
40 9641
41 10137
42 11113
43 11609
44 12585
45 13577

List of values

[1, 5, 13, 25, 45, 69, 113, 141, 193, 249, 353, 409, 513, 625, 837, 897, 1013, 1133, 1365, 1485, 1717, 1957, 2421, 2541, 2773, 3013, 3477, 3717, 4181, 4661, 5593, 5717, 5961, 6209, 6697, 6945, 7433, 7929, 8905, 9153, 9641, 10137, 11113, 11609, 12585, 13577]