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A219815 as a simple table

na(n)
128
291
31588
422017
5283334
63967857
759065976
8864699568
912174420630
10164256040933
112133182509213

[28,91,1588,22017,283334,3967857,59065976,
 864699568,12174420630,164256040933,2133182509213]