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A303030 as a simple table

na(n)
01
11
22
34
412
522
668
7166
8534
91589
105464
1118579
1268320
13255424
141000852
154018156
1616671976
1770890940
18309439942
191381815168
206310880471
2129428287639
22140012980007
23678970863717
243353545264060
2516857749613964
2686191265140699
27447951112379963
282365177154077186

[1,1,2,4,12,22,68,166,534,1589,5464,18579,68320,
 255424,1000852,4018156,16671976,70890940,
 309439942,1381815168,6310880471,29428287639,
 140012980007,678970863717,3353545264060,
 16857749613964,86191265140699,447951112379963,
 2365177154077186]