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A020006 as a simple table

na(n)
01
11
21
34
416
577
6449
73060
823920
9210929
102070941
1122403814
12264772349
133393900115
1446897528867
15694936109571
1610992625733214
17184875978240420
183294153794102035
1961989985034465559
201228528794319408361

[1,1,1,4,16,77,449,3060,23920,210929,2070941,
 22403814,264772349,3393900115,46897528867,
 694936109571,10992625733214,184875978240420,
 3294153794102035,61989985034465559,
 1228528794319408361]