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A060603 as a simple table

na(n)
10
21
327
4640
515625
6408240
711529602
8352321536
911622614670
10412500000000
1115692141883605
12637501182050304
1327561634699895023
141263990776407224320
1561305144653320312500
163135946492530623774720
17168757013424812699892108

[0,1,27,640,15625,408240,11529602,352321536,
 11622614670,412500000000,15692141883605,
 637501182050304,27561634699895023,
 1263990776407224320,61305144653320312500,
 3135946492530623774720,168757013424812699892108]