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A141307 as a simple table

na(n)
12
24
324
4208
52272
629504
7441216
87447808
9139951616
102897228800
1165533753344
121608679247872
1342607095439360
141211489065582592
1536818002833014784
161191230067009978368
1740888060455008731136
181484180363633916903424
1956809679459301490950144
202287045885619374501396480
2196608773951155028111654912

[2,4,24,208,2272,29504,441216,7447808,139951616,
 2897228800,65533753344,1608679247872,
 42607095439360,1211489065582592,36818002833014784,
 1191230067009978368,40888060455008731136,
 1484180363633916903424,56809679459301490950144,
 2287045885619374501396480,
 96608773951155028111654912]