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A020080 as a simple table

na(n)
01
10
21
34
416
580
6467
73196
825042
9221208
102175216
1123564850
12278850730
133578584368
1449503750432
15734305631412
1611626505830701
17195712848150140
183490212458677514
1965732334638426516
201303691303662125905

[1,0,1,4,16,80,467,3196,25042,221208,2175216,
 23564850,278850730,3578584368,49503750432,
 734305631412,11626505830701,195712848150140,
 3490212458677514,65732334638426516,
 1303691303662125905]