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.

A245901 Number of permutations of length 2n-1 avoiding 231 that can be realized on increasing binary trees.

Table of values

n a(n)
1 1
2 2
3 10
4 74
5 667

List of values

[1, 2, 10, 74, 667]