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A084286 as a simple table

na(n)
11
21
34
438
5728
626704
71866255
8251547611
966295198837
1034494681184926
1135636712584655663

[1,1,4,38,728,26704,1866255,251547611,66295198837,
 34494681184926,35636712584655663]