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A138477 as a simple table

na(n)
00
10
21
32
43
56
615
730
855
9110
10231
11462
12903
131806
143655
157310
1614535
1729070
1858311
19116622
20232903
21465806
22932295
231864590
243727815
257455630
2614913991
2729827982
2859650503
29119301006
30238612935
31477225870
32954429895
331908859790
343817763271
357635526542

[0,0,1,2,3,6,15,30,55,110,231,462,903,1806,3655,
 7310,14535,29070,58311,116622,232903,465806,
 932295,1864590,3727815,7455630,14913991,29827982,
 59650503,119301006,238612935,477225870,954429895,
 1908859790,3817763271,7635526542]