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A056837 as a simple table

na(n)
00
10
21
31
42
53
65
76
88
910
1013
1115
1218
1321
1425
1528
1632
1736
1841
1945
2050
2155
2261
2366
2472
2578

[0,0,1,1,2,3,5,6,8,10,13,15,18,21,25,28,32,36,41,
 45,50,55,61,66,72,78]