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A128639 as a simple table

na(n)
01
18
240
3152
4488
51392
63640
78896
820584
945512
1096816
11199200
12398072
13775216
141475264
152749776
165029736
179043344
1816005352
1927918304
2048047280
2181661504
22137183136
23227952960
24374924152
25610743224
26985891568
271577869784
282504850112
293945854640
306170415888

[1,8,40,152,488,1392,3640,8896,20584,45512,96816,
 199200,398072,775216,1475264,2749776,5029736,
 9043344,16005352,27918304,48047280,81661504,
 137183136,227952960,374924152,610743224,985891568,
 1577869784,2504850112,3945854640,6170415888]