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A220830 as a simple table

na(n)
10
20
31
46
530
6140
7663
83186
915642
1078441
11400842
122084698
1311009358
1458955139
15319619706
161752122667
179700923252
1854194387085
19305216395077
201731579241287
219889280682948
2256822058078669
23328300135291659
241906449141877331
2511122447670117451
2665168427936552522

[0,0,1,6,30,140,663,3186,15642,78441,400842,
 2084698,11009358,58955139,319619706,1752122667,
 9700923252,54194387085,305216395077,1731579241287,
 9889280682948,56822058078669,328300135291659,
 1906449141877331,11122447670117451,
 65168427936552522]