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A099177 as a simple table

na(n)
00
11
22
38
420
560
6160
7448
81216
93344
109120
1124960
1268160
13186304
14508928
151390592
163799040
1710379520
1828357120
1977473792
20211661824
21578272256
221579868160
234316282880
2411792302080
2532217174016
2688018952192
27240472260608

[0,1,2,8,20,60,160,448,1216,3344,9120,24960,68160,
 186304,508928,1390592,3799040,10379520,28357120,
 77473792,211661824,578272256,1579868160,
 4316282880,11792302080,32217174016,88018952192,
 240472260608]