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A120414 as a simple table

na(n)
00
11
22
36
418
545
6102
7213
8426
9821
101538
112820
125075
138996
1415743
1527247
1646709
1779405
18133996
19224640
20374400

[0,1,2,6,18,45,102,213,426,821,1538,2820,5075,
 8996,15743,27247,46709,79405,133996,224640,374400]