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A231125 as a simple table

na(n)
12
28
340
4176
5808
63584
716368
872640
9331648
101471872
116719936
1229823488
13136161152
14604291584
152758934016
1612244319232
1755902265856
18248097701888
191132706802688
205027022614528
2122951211032576
22101858889359360

[2,8,40,176,808,3584,16368,72640,331648,1471872,
 6719936,29823488,136161152,604291584,2758934016,
 12244319232,55902265856,248097701888,
 1132706802688,5027022614528,22951211032576,
 101858889359360]