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A191575 as a simple table

na(n)
12
28
364
41024
531744
61966328
7243334360
860208129728
929758502758208
1029361656860572672
1157846064835261224704
12227511075000523635983456
131786387499611617848051648112
1428002804481527546759736622292320

[2,8,64,1024,31744,1966328,243334360,60208129728,
 29758502758208,29361656860572672,
 57846064835261224704,227511075000523635983456,
 1786387499611617848051648112,
 28002804481527546759736622292320]