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A270985 as a simple table

na(n)
01
15
220
376
4300
51212
64900
719740
879284
9317836
101272804
115094204
1220382868
1381543660
14326199108
151304845468

[1,5,20,76,300,1212,4900,19740,79284,317836,
 1272804,5094204,20382868,81543660,326199108,
 1304845468]