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A038286 as a simple table

na(n)
01
18
28
364
4128
564
6512
71536
81536
9512
104096
1116384
1224576
1316384
144096
1532768
16163840
17327680
18327680
19163840
2032768
21262144
221572864
233932160
245242880
253932160
261572864
27262144
282097152
2914680064
3044040192
3173400320

[1,8,8,64,128,64,512,1536,1536,512,4096,16384,
 24576,16384,4096,32768,163840,327680,327680,
 163840,32768,262144,1572864,3932160,5242880,
 3932160,1572864,262144,2097152,14680064,44040192,
 73400320]