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.

A254217 Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

Table of values

n a(n)
1 5
2 12
3 48
4 168
5 766
6 3720
7 18214
8 81428
9 362910
10 1828848
11 9781293
12 49824190
13 241134125
14 1198202218
15 6489872942
16 36558663886
17 196996500006
18 982525116524
19 4694315336320
20 23819615009274
21 140719786602875
22 913403203820358
23 5715151962243604
24 32271875770787666

List of values

[5, 12, 48, 168, 766, 3720, 18214, 81428, 362910, 1828848, 9781293, 49824190, 241134125, 1198202218, 6489872942, 36558663886, 196996500006, 982525116524, 4694315336320, 23819615009274, 140719786602875, 913403203820358, 5715151962243604, 32271875770787666]

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

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