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A221066 as a simple table

na(n)
12
28
320
456
5168
6476
71364
83952
911360
1032692
1194236
12271352
13781432
142250892
156482724
1618670784
1753775312
18154880036
19446074860
201284760776
213700290152
2210657349244
2330694667380
2488404940816
25254618597952
26733337259924

[2,8,20,56,168,476,1364,3952,11360,32692,94236,
 271352,781432,2250892,6482724,18670784,53775312,
 154880036,446074860,1284760776,3700290152,
 10657349244,30694667380,88404940816,254618597952,
 733337259924]