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.

A217812 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Table of values

n a(n)
0 1
1 2
2 16
3 243
4 5291
5 144430
6 4601223
7 164005785
8 2072049543

List of values

[1, 2, 16, 243, 5291, 144430, 4601223, 164005785, 2072049543]