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A099176 as a simple table

na(n)
01
11
24
38
424
560
6168
7448
81232
93344
109152
1124960
1268224
13186304
14509056
151390592
163799296
1710379520
1828357632
1977473792
20211662848
21578272256
221579870208
234316282880
2411792306176
2532217174016
2688018960384
27240472260608

[1,1,4,8,24,60,168,448,1232,3344,9152,24960,68224,
 186304,509056,1390592,3799296,10379520,28357632,
 77473792,211662848,578272256,1579870208,
 4316282880,11792306176,32217174016,88018960384,
 240472260608]