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A239224 as a simple table

na(n)
11
24
36
432
540
6256
7896
84096
94608
1065536
11360448
12524288
131703936
144194304
1510485760
16134217728
17142606336
184294967296
1940802189312
2034359738368
21180388626432
22274877906944
233161095929856
244398046511104
2513743895347200
2670368744177664
27949978046398464

[1,4,6,32,40,256,896,4096,4608,65536,360448,
 524288,1703936,4194304,10485760,134217728,
 142606336,4294967296,40802189312,34359738368,
 180388626432,274877906944,3161095929856,
 4398046511104,13743895347200,70368744177664,
 949978046398464]