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.

A293489 E.g.f.: Product_{m>0} (1 + x^(2*m-1) + x^(4*m-2)/2! + x^(6*m-3)/3!).

Table of values

n a(n)
0 1
1 1
2 1
3 7
4 24
5 180
6 1200
7 10080
8 97440
9 997920
10 12096000
11 149688000
12 2128896000
13 31135104000
14 515804889600
15 8717829120000
16 162151621632000
17 3092504583168000
18 63934815200256000
19 1366817864315904000
20 31019500604252160000
21 733013100880220160000

List of values

[1, 1, 1, 7, 24, 180, 1200, 10080, 97440, 997920, 12096000, 149688000, 2128896000, 31135104000, 515804889600, 8717829120000, 162151621632000, 3092504583168000, 63934815200256000, 1366817864315904000, 31019500604252160000, 733013100880220160000]