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A129952 as a simple table

na(n)
01
11
22
36
416
540
696
7224
8512
91152
102560
115632
1212288
1326624
1457344
15122880
16262144
17557056
181179648
192490368
205242880
2111010048
2223068672
2348234496
24100663296
25209715200
26436207616
27905969664
281879048192
293892314112

[1,1,2,6,16,40,96,224,512,1152,2560,5632,12288,
 26624,57344,122880,262144,557056,1179648,2490368,
 5242880,11010048,23068672,48234496,100663296,
 209715200,436207616,905969664,1879048192,
 3892314112]