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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.

A254206 Number of length 3 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.

Table of values

n a(n)
1 0
2 2
3 4
4 17
5 18
6 47
7 68
8 119
9 131
10 226
11 237
12 370
13 475
14 644
15 678
16 949
17 985
18 1303
19 1544
20 1903
21 1966
22 2511
23 2864
24 3440
25 3890
26 4564
27 4716
28 5658
29 5781
30 6672
31 7421
32 8442
33 9295
34 10640
35 10833
36 12154
37 13274
38 14792
39 15101
40 17017
41 17322
42 19177
43 20728
44 22792
45 23197

List of values

[0, 2, 4, 17, 18, 47, 68, 119, 131, 226, 237, 370, 475, 644, 678, 949, 985, 1303, 1544, 1903, 1966, 2511, 2864, 3440, 3890, 4564, 4716, 5658, 5781, 6672, 7421, 8442, 9295, 10640, 10833, 12154, 13274, 14792, 15101, 17017, 17322, 19177, 20728, 22792, 23197]

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

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