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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.

A262171 Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value <= 9.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 20
5 87
6 522
7 3271
8 26168
9 214955
10 2149549
11 21881092
12 262569097
13 3191307394
14 44674222343
15 631473609984
16 10100709895340
17 162823295801791
18 2928983654856296
19 53036572897985517
20 1059539775650223369
21 21293220263695186990
22 467627502721031824736

List of values

[1, 1, 2, 5, 20, 87, 522, 3271, 26168, 214955, 2149549, 21881092, 262569097, 3191307394, 44674222343, 631473609984, 10100709895340, 162823295801791, 2928983654856296, 53036572897985517, 1059539775650223369, 21293220263695186990, 467627502721031824736]

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

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