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.

A181991 n-alternating permutations of length 4n.

Table of values

n a(n)
1 1
2 1385
3 315523
4 60376809
5 11593285251
6 2301250545971
7 472105349529479
8 99537885358650089
9 21451428576293883859
10 4705284467293276073635
11 1047067375984978044542143
12 235809039854522043890582835
13 53644722291938408687646120103
14 12309355014854205055828909176039

List of values

[1, 1385, 315523, 60376809, 11593285251, 2301250545971, 472105349529479, 99537885358650089, 21451428576293883859, 4705284467293276073635, 1047067375984978044542143, 235809039854522043890582835, 53644722291938408687646120103, 12309355014854205055828909176039]

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

Content is available under The OEIS End-User License Agreement.