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A221270 as a simple table

na(n)
10
26
316
452
5174
6588
71984
86688
922536
1075924
11255760
12861496
132901696
149773184
1532916280
16110861104
17373373568
181257492096
194235114944
2014263430416
2148037679232
22161785483872
23544874848384
241835074738624
256180315022560

[0,6,16,52,174,588,1984,6688,22536,75924,255760,
 861496,2901696,9773184,32916280,110861104,
 373373568,1257492096,4235114944,14263430416,
 48037679232,161785483872,544874848384,
 1835074738624,6180315022560]