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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.

A317131 Number of permutations of [n] whose lengths of increasing runs are prime numbers.

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 5
5 19
6 80
7 520
8 2898
9 22486
10 171460
11 1509534
12 14446457
13 147241144
14 1650934446
15 19494460567
16 248182635904
17 3340565727176
18 47659710452780
19 718389090777485
20 11381176852445592
21 189580213656445309
22 3305258537062221020
23 60273557241570401742

List of values

[1, 0, 1, 1, 5, 19, 80, 520, 2898, 22486, 171460, 1509534, 14446457, 147241144, 1650934446, 19494460567, 248182635904, 3340565727176, 47659710452780, 718389090777485, 11381176852445592, 189580213656445309, 3305258537062221020, 60273557241570401742]

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

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