login

A090755 as a simple table

na(n)
01
11
22
36
424
540
6720
75040
813440
9362880
103628800
1113305600
12479001600
13889574400
1429059430400
151307674368000
161609445376000
17118562476032000
186402373705728000
19121645100408832000
20115852476579840000

[1,1,2,6,24,40,720,5040,13440,362880,3628800,
 13305600,479001600,889574400,29059430400,
 1307674368000,1609445376000,118562476032000,
 6402373705728000,121645100408832000,
 115852476579840000]