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A138405 as a simple table

na(n)
128
2234
33100
416758
5160930
6371124
71419568
82475738
96435814
1020510308
1128628190
1269342588
13115854520
14147006594
15229342798
16418192684
17714920818
18844592580
191350120618
201804224310
212073066264
223077050158
233939033754
245584051528
258587330848
2610510090300

[28,234,3100,16758,160930,371124,1419568,2475738,
 6435814,20510308,28628190,69342588,115854520,
 147006594,229342798,418192684,714920818,844592580,
 1350120618,1804224310,2073066264,3077050158,
 3939033754,5584051528,8587330848,10510090300]