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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.

A271720 a(1)=1; for n>1, define a sequence {b(m), m >= 1} by b(1)=n b(2)=13, and b(m) = A020639(b(m-2)) + A006530(b(m-1)); then a(n) is the number of terms in that sequence before the first of the infinite string of 4s.

Table of values

n a(n)
1 8
2 13
3 15
4 13
5 4
6 13
7 12
8 13
9 15
10 13
11 4
12 13
13 16
14 13
15 15
16 13
17 12
18 13
19 15
20 13
21 15
22 13
23 4
24 13
25 4
26 13
27 15
28 13
29 8
30 13
31 12
32 13
33 15
34 13
35 4
36 13
37 12
38 13
39 15
40 13
41 4
42 13
43 8
44 13
45 15
46 13
47 12
48 13
49 12
50 13
51 15
52 13
53 12
54 13
55 4
56 13
57 15
58 13
59 4
60 13
61 8
62 13
63 15
64 13
65 4
66 13
67 12
68 13
69 15
70 13
71 8
72 13
73 11
74 13
75 15
76 13
77 12
78 13

List of values

[8, 13, 15, 13, 4, 13, 12, 13, 15, 13, 4, 13, 16, 13, 15, 13, 12, 13, 15, 13, 15, 13, 4, 13, 4, 13, 15, 13, 8, 13, 12, 13, 15, 13, 4, 13, 12, 13, 15, 13, 4, 13, 8, 13, 15, 13, 12, 13, 12, 13, 15, 13, 12, 13, 4, 13, 15, 13, 4, 13, 8, 13, 15, 13, 4, 13, 12, 13, 15, 13, 8, 13, 11, 13, 15, 13, 12, 13]

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