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A253485 as a simple table

na(n)
127000
21066300
344943722
41878758740
578770049974
63299718630574
7138306215163096
85795836568371696
9242904782424601668
1010179772843302464230
11426626399166621668992
1217879460458074006160518

[27000,1066300,44943722,1878758740,78770049974,
 3299718630574,138306215163096,5795836568371696,
 242904782424601668,10179772843302464230,
 426626399166621668992,17879460458074006160518]