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A280763 as a simple table

na(n)
11
21
32
46
518
675
7318
81599
98439
1048824
11300747
122030086
1315425065
14141798617

[1,1,2,6,18,75,318,1599,8439,48824,300747,2030086,
 15425065,141798617]