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.

A357721 a(n) = Sum_{k=0..floor(n/2)} (-n)^k * Stirling1(n,2*k).

Table of values

n a(n)
0 1
1 0
2 -2
3 9
4 -28
5 0
6 1200
7 -16464
8 167904
9 -1393200
10 7429240
11 43124400
12 -2404571904
13 55590286752
14 -1027511503200
15 16489054310400
16 -222885864448000
17 1994839594780032
18 14489184835474272
19 -1470395490046560000
20 54581408106475622400
21 -1608207353670788640000

List of values

[1, 0, -2, 9, -28, 0, 1200, -16464, 167904, -1393200, 7429240, 43124400, -2404571904, 55590286752, -1027511503200, 16489054310400, -222885864448000, 1994839594780032, 14489184835474272, -1470395490046560000, 54581408106475622400, -1608207353670788640000]

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

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