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A006479 as a simple table

na(n)
00
10
20
31
45
518
652
7134
8318
9713
101531
113180
126432
1312732
1424756
1547417
1689665
17167694
18310628
19570562
201040226
211883953
223391799
236073848
2410824096
2519204536
2633936456

[0,0,0,1,5,18,52,134,318,713,1531,3180,6432,12732,
 24756,47417,89665,167694,310628,570562,1040226,
 1883953,3391799,6073848,10824096,19204536,
 33936456]