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A028340 as a simple table

na(n)
31
416
5230
63480
757379
81038016
920570444
10444647600
1110431670821
12264300628944
137198061846898
14209814739262856
156520139954328519
16215245451727154944
177524314127912551832
18277705505168550027360
1910792700030471840300745
20440604294676004639627280

[1,16,230,3480,57379,1038016,20570444,444647600,
 10431670821,264300628944,7198061846898,
 209814739262856,6520139954328519,
 215245451727154944,7524314127912551832,
 277705505168550027360,10792700030471840300745,
 440604294676004639627280]