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.

A320983 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value of nine.

Table of values

n a(n)
9 0
10 1
11 10
12 4116
13 45431
14 4619654
15 56724741
16 3604309466
17 49361628592
18 2539183745028
19 38672184949164
20 1795814647499288
21 30258670886635123
22 1339822976545126729
23 24829628782352186543
24 1080751193228180109916
25 21899879370157544611142
26 954090805109110152360526

List of values

[0, 1, 10, 4116, 45431, 4619654, 56724741, 3604309466, 49361628592, 2539183745028, 38672184949164, 1795814647499288, 30258670886635123, 1339822976545126729, 24829628782352186543, 1080751193228180109916, 21899879370157544611142, 954090805109110152360526]

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

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