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.

A380491 a(n) = n! * Sum_{k=0..n} binomial(2*n-3,k)/(n-k)!.

Table of values

n a(n)
0 1
1 0
2 3
3 34
4 501
5 9276
6 207775
7 5470158
8 165625929
9 5671386136
10 216730118331
11 9144481575450
12 422249317829053
13 21180324426577044
14 1146880568461500951
15 66677192513929212166
16 4142571510546929867025
17 273910161452560881843888
18 19204878684852222745880179

List of values

[1, 0, 3, 34, 501, 9276, 207775, 5470158, 165625929, 5671386136, 216730118331, 9144481575450, 422249317829053, 21180324426577044, 1146880568461500951, 66677192513929212166, 4142571510546929867025, 273910161452560881843888, 19204878684852222745880179]

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

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