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A177454 as a simple table

na(n)
12
26
350
4490
564130
6800046
7137270954
81860277042
9357975249026
101036802293087622
1115013817846943906
1247192717955016924590
1310360599532897359064118
14154361699651715243559786

[2,6,50,490,64130,800046,137270954,1860277042,
 357975249026,1036802293087622,15013817846943906,
 47192717955016924590,10360599532897359064118,
 154361699651715243559786]