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A000284 as a simple table

na(n)
00
11
21
32
49
5731
6390617900
759601394712394173339000731
8211723599072542785377729319366442939995427829921816290889198752331804918235791

[0,1,1,2,9,731,390617900,
 59601394712394173339000731,
 21172359907254278537772931936644293999542782992181\
 6290889198752331804918235791]