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.

A274845 a(0)=1, a(1)=0, a(4n+2) = a(4n+3) = a(4n+5) = (4^(n+1) +(-1)^n)/5, a(4n+4) = (2*4^(n+1) -3*(-1)^n)/5.

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 1
5 1
6 3
7 3
8 7
9 3
10 13
11 13
12 25
13 13
14 51
15 51
16 103
17 51
18 205
19 205
20 409
21 205
22 819
23 819
24 1639
25 819
26 3277
27 3277
28 6553
29 3277
30 13107
31 13107
32 26215
33 13107
34 52429
35 52429
36 104857
37 52429
38 209715
39 209715
40 419431
41 209715
42 838861
43 838861
44 1677721
45 838861
46 3355443

List of values

[1, 0, 1, 1, 1, 1, 3, 3, 7, 3, 13, 13, 25, 13, 51, 51, 103, 51, 205, 205, 409, 205, 819, 819, 1639, 819, 3277, 3277, 6553, 3277, 13107, 13107, 26215, 13107, 52429, 52429, 104857, 52429, 209715, 209715, 419431, 209715, 838861, 838861, 1677721, 838861, 3355443]