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A205312 as a simple table

na(n)
120
284
3376
41708
57784
635500
7161928
8738636
93369320
1015369324
1170107976
12319801228
131458790184
146654348460
1530354161928
16138462112716
17631602239720
182881086973164
1913142230386376
2059948977985548
21273460429154984

[20,84,376,1708,7784,35500,161928,738636,3369320,
 15369324,70107976,319801228,1458790184,6654348460,
 30354161928,138462112716,631602239720,
 2881086973164,13142230386376,59948977985548,
 273460429154984]