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A281949 as a simple table

na(n)
12
28
330
4112
5420
61576
75912
822176
983184
10312032
111170464
124390528
1316469312
1461778048
15231735680
16869263872
173260696320
1812231200256
1945880463872
20172102240256
21645572834304
222421608712192
239083698141184
2434073866477568

[2,8,30,112,420,1576,5912,22176,83184,312032,
 1170464,4390528,16469312,61778048,231735680,
 869263872,3260696320,12231200256,45880463872,
 172102240256,645572834304,2421608712192,
 9083698141184,34073866477568]