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A261520 as a simple table

na(n)
01
16
236
3200
41038
55160
624776
7115632
8527172
92355998
1010349448
1144783064
12191211512
13806737800
143367294320
1513918479872
1657020736942
17231697484304
18934399998412
193742041461976
2014888854356840
2158881590423856
22231542984619720
23905666813058384

[1,6,36,200,1038,5160,24776,115632,527172,2355998,
 10349448,44783064,191211512,806737800,3367294320,
 13918479872,57020736942,231697484304,934399998412,
 3742041461976,14888854356840,58881590423856,
 231542984619720,905666813058384]