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A278848 as a simple table

na(n)
10
20
366
430772
59317846
64026240722
73637198028018
88472288445687482
956864856173457018228
101168082099198500119983316

[0,0,66,30772,9317846,4026240722,3637198028018,
 8472288445687482,56864856173457018228,
 1168082099198500119983316]