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A120567 as a simple table

na(n)
11
21
32
45
515
653
7215
8976
94859
1026150
11150585
12920910
135946929
1440369352
15287020631
162130932767
1716478548793
18132438164617
191104141400679
209532801486793
2185102769453094
22784511536839904
237458380835336557

[1,1,2,5,15,53,215,976,4859,26150,150585,920910,
 5946929,40369352,287020631,2130932767,16478548793,
 132438164617,1104141400679,9532801486793,
 85102769453094,784511536839904,7458380835336557]