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A308433 as a simple table

na(n)
11
22
33
48
515
636
784
8200
9468
101130
112717
126576
1315938
1438780
1594485
16230816
17564553
181383318
193393742
208336960
2120502216
2250472928
23124369832
24306729456
25757078000
261870040822
274622317812
2811432698704
2928294211920
3070063292310
31173584768088
32430276174016
331067049650238

[1,2,3,8,15,36,84,200,468,1130,2717,6576,15938,
 38780,94485,230816,564553,1383318,3393742,8336960,
 20502216,50472928,124369832,306729456,757078000,
 1870040822,4622317812,11432698704,28294211920,
 70063292310,173584768088,430276174016,
 1067049650238]