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A005548 as a simple table

na(n)
36
472
5690
66192
753946
8466800
94053816
1035450940
11312411672
122773863060
1324802293720
14223203954264
152020552369164

[6,72,690,6192,53946,466800,4053816,35450940,
 312411672,2773863060,24802293720,223203954264,
 2020552369164]