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.

A210029 Number of sequences over the alphabet of n symbols of length 2n which have n distinct symbols. Also number of placements of 2n balls into n cells where no cell is empty.

Table of values

n a(n)
1 1
2 14
3 540
4 40824
5 5103000
6 953029440
7 248619571200
8 86355926616960
9 38528927611574400
10 21473732319740064000
11 14620825330739032204800
12 11941607887300551753216000
13 11523529003703200697461248000
14 12970646659082235068963297280000

List of values

[1, 14, 540, 40824, 5103000, 953029440, 248619571200, 86355926616960, 38528927611574400, 21473732319740064000, 14620825330739032204800, 11941607887300551753216000, 11523529003703200697461248000, 12970646659082235068963297280000]

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

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