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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.

A254199 Number of length n 1..(3+2) arrays with no leading or trailing partial sum equal to a prime.

Table of values

n a(n)
1 2
2 1
3 4
4 9
5 21
6 47
7 118
8 333
9 984
10 3362
11 12643
12 39490
13 98542
14 227138
15 581068
16 1805114
17 6540668
18 24406560
19 85426548
20 274421967
21 815755674
22 2293410096
23 6495970695
24 20483223847
25 74509476318
26 290215121856
27 1104108812114
28 3894326230239

List of values

[2, 1, 4, 9, 21, 47, 118, 333, 984, 3362, 12643, 39490, 98542, 227138, 581068, 1805114, 6540668, 24406560, 85426548, 274421967, 815755674, 2293410096, 6495970695, 20483223847, 74509476318, 290215121856, 1104108812114, 3894326230239]

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

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