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A298098 as a simple table

na(n)
10
25
33
420
570
6847
72934
827671
9139992
101031816
115985115
1241326422
13252034826
141675068288
1510527431309
1668645440055
17436700979975
182826143858103
1918075619384704
20116539777329390
21747352195049649
224809997865329487

[0,5,3,20,70,847,2934,27671,139992,1031816,
 5985115,41326422,252034826,1675068288,10527431309,
 68645440055,436700979975,2826143858103,
 18075619384704,116539777329390,747352195049649,
 4809997865329487]