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A087447 as a simple table

na(n)
01
11
24
310
424
556
6128
7288
8640
91408
103072
116656
1214336
1330720
1465536
15139264
16294912
17622592
181310720
192752512
205767168
2112058624
2225165824
2352428800
24109051904
25226492416
26469762048
27973078528
282013265920
294160749568

[1,1,4,10,24,56,128,288,640,1408,3072,6656,14336,
 30720,65536,139264,294912,622592,1310720,2752512,
 5767168,12058624,25165824,52428800,109051904,
 226492416,469762048,973078528,2013265920,
 4160749568]