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A000986 as a simple table

na(n)
01
10
21
34
418
5112
6820
76912
866178
9708256
108372754
11108306280
121521077404
1323041655136
14374385141832
156493515450688
16119724090206940
172337913445039488
1848195668439235612
191045828865817825264
2023826258064972682776
21568556266922455167040

[1,0,1,4,18,112,820,6912,66178,708256,8372754,
 108306280,1521077404,23041655136,374385141832,
 6493515450688,119724090206940,2337913445039488,
 48195668439235612,1045828865817825264,
 23826258064972682776,568556266922455167040]