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.

A266947 Number of permutations p of [2n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value of n.

Table of values

n a(n)
0 1
1 1
2 11
3 130
4 4734
5 127538
6 11174035
7 554432537
8 92953037066
9 7392808621010
10 2037044419366071
11 237281497432517293
12 97619260603080874874
13 15664643539583989506694
14 9013597510492035989870645
15 1906222253095637349478735538
16 1463288823474568248157186058298

List of values

[1, 1, 11, 130, 4734, 127538, 11174035, 554432537, 92953037066, 7392808621010, 2037044419366071, 237281497432517293, 97619260603080874874, 15664643539583989506694, 9013597510492035989870645, 1906222253095637349478735538, 1463288823474568248157186058298]

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

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