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A018115 as a simple table

na(n)
01
12
25
311
424
553
6118
7260
8576
91275
102822
116246
1213824
1330598
1467723
15149897
16331776
17734341
181625364
193597522
207962624
2117624184
2239008732
2386340516
24191102976
25422980417
26936209559
272072172384

[1,2,5,11,24,53,118,260,576,1275,2822,6246,13824,
 30598,67723,149897,331776,734341,1625364,3597522,
 7962624,17624184,39008732,86340516,191102976,
 422980417,936209559,2072172384]