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A131885 as a simple table

na(n)
01
12
24
36
48
512
624
756
8128
9272
10544
111056
122048
134032
148064
1516256
1632768
1765792
18131584
19262656
20524288
211047552
222095104
234192256
248388608
2516781312
2633562624
2767117056
28134217728
29268419072
30536838144
311073709056
322147483648
334295032832
348590065664

[1,2,4,6,8,12,24,56,128,272,544,1056,2048,4032,
 8064,16256,32768,65792,131584,262656,524288,
 1047552,2095104,4192256,8388608,16781312,33562624,
 67117056,134217728,268419072,536838144,1073709056,
 2147483648,4295032832,8590065664]