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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.

A238549 a(n) is one fourth of the total number of free ends of 4 line segments expansion at n iterations (see Comments lines for definition).

Table of values

n a(n)
1 1
2 2
3 6
4 8
5 16
6 20
7 36
8 44
9 76
10 92
11 156
12 188
13 316
14 380
15 636
16 764
17 1276
18 1532
19 2556
20 3068
21 5116
22 6140
23 10236
24 12284
25 20476
26 24572
27 40956
28 49148
29 81916
30 98300
31 163836
32 196604
33 327676
34 393212
35 655356
36 786428
37 1310716
38 1572860
39 2621436
40 3145724
41 5242876
42 6291452
43 10485756

List of values

[1, 2, 6, 8, 16, 20, 36, 44, 76, 92, 156, 188, 316, 380, 636, 764, 1276, 1532, 2556, 3068, 5116, 6140, 10236, 12284, 20476, 24572, 40956, 49148, 81916, 98300, 163836, 196604, 327676, 393212, 655356, 786428, 1310716, 1572860, 2621436, 3145724, 5242876, 6291452, 10485756]

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

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