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A220720 as a simple table

na(n)
11
27
330
4126
5534
62275
79667
841089
9174660
10742428
113155820
1213414405
1357020437
14242375995
151030264362
164379330826
1718615162402
1879127219431
19336345003127
201429697162869
216077194423824
2225832248272072
23109804788896376

[1,7,30,126,534,2275,9667,41089,174660,742428,
 3155820,13414405,57020437,242375995,1030264362,
 4379330826,18615162402,79127219431,336345003127,
 1429697162869,6077194423824,25832248272072,
 109804788896376]