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A138613 as a simple table

na(n)
12
25
326
4850
5943950
61318281510000
72755017380686402917800000
810751241448828145947377163154256928532205365443200
9186653497320711305248493130820948403307540799528422902350199946673943964748877201760000000000000000

[2,5,26,850,943950,1318281510000,
 2755017380686402917800000,
 10751241448828145947377163154256928532205365443200\
 ,
 18665349732071130524849313082094840330754079952842\
 2902350199946673943964748877201760000000000000000]