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A346509 as a simple table

na(n)
10
20
312
4200
52660
631850
7361985
83982799
942914655
10455727689
114788989458
1249930700093
13517443017072
145336861879564

[0,0,12,200,2660,31850,361985,3982799,42914655,
 455727689,4788989458,49930700093,517443017072,
 5336861879564]