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A305986 as a simple table

na(n)
01
11
24
321
4144
51205
611908
7135597
81745488
925045821
10396249564
116850289765
12128438323720
132595394603269
1456224162108468
151299717221807229
1631931915643021504
17830816659779428525
1822820190255069409804
19659845945466402034165
2020034230527927369097848
21637252918691725377815349

[1,1,4,21,144,1205,11908,135597,1745488,25045821,
 396249564,6850289765,128438323720,2595394603269,
 56224162108468,1299717221807229,31931915643021504,
 830816659779428525,22820190255069409804,
 659845945466402034165,20034230527927369097848,
 637252918691725377815349]