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A270856 as a simple table

na(n)
10
20
3460494
44875050400
55281372355106
62104222937252028
7358240737864481086
841234776662339168204
92798233542174582927894
10142439611138184581460718

[0,0,460494,4875050400,5281372355106,
 2104222937252028,358240737864481086,
 41234776662339168204,2798233542174582927894,
 142439611138184581460718]