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A155803 as a simple table

na(n)
00
10
20
31
42
54
69
718
836
973
10146
11292
12585
131170
142340
154681
169362
1718724
1837449
1974898
20149796
21299593
22599186
231198372
242396745
254793490
269586980
2719173961
2838347922
2976695844
30153391689
31306783378
32613566756
331227133513
342454267026
354908534052

[0,0,0,1,2,4,9,18,36,73,146,292,585,1170,2340,
 4681,9362,18724,37449,74898,149796,299593,599186,
 1198372,2396745,4793490,9586980,19173961,38347922,
 76695844,153391689,306783378,613566756,1227133513,
 2454267026,4908534052]