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.

A051459 Number of orderings of the subsets of a set with n elements that are compatible with the subsets' sizes; i.e., if A, B are two subsets with A <= B then Card(A) <= Card(B).

Table of values

n a(n)
0 1
1 1
2 2
3 36
4 414720
5 189621927936000000
6 2156695499113014719143826715127578624000000000000

List of values

[1, 1, 2, 36, 414720, 189621927936000000, 2156695499113014719143826715127578624000000000000]

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

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