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A164591 as a simple table

na(n)
01
17
248
3328
42240
515296
6104448
7713216
84870144
933255424
10227082240
111550614528
1210588258304
1372301150208
14493703135232
153371215880192
1623020101959680
17157191088635904
181073367893409792
197329414438191104
2050048372358250496

[1,7,48,328,2240,15296,104448,713216,4870144,
 33255424,227082240,1550614528,10588258304,
 72301150208,493703135232,3371215880192,
 23020101959680,157191088635904,1073367893409792,
 7329414438191104,50048372358250496]