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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.

A231410 Number of permutations of [n] with exactly n-3 (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down).

Table of values

n a(n)
3 6
4 11
5 29
6 99
7 367
8 1543
9 7901
10 41759
11 241361
12 1647843
13 11321131
14 83279563
15 710717285
16 6009605795
17 53680350389
18 549737059971
19 5519982252151
20 58008028652479
21 693065960525741
22 8057982367331159
23 97381078055591177
24 1329697914765988419
25 17567989325451095443

List of values

[6, 11, 29, 99, 367, 1543, 7901, 41759, 241361, 1647843, 11321131, 83279563, 710717285, 6009605795, 53680350389, 549737059971, 5519982252151, 58008028652479, 693065960525741, 8057982367331159, 97381078055591177, 1329697914765988419, 17567989325451095443]

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

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