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A071599 as a simple table

na(n)
12
28
324
4216
54320
619008
7103488
81292544
91548288
103264307200
1124710676480
1254623600640
1316562257920
143345695539200
158216950210560
1633673108783104000
17205682009702400000
1815655109317676236800
1912302792042521559040000

[2,8,24,216,4320,19008,103488,1292544,1548288,
 3264307200,24710676480,54623600640,16562257920,
 3345695539200,8216950210560,33673108783104000,
 205682009702400000,15655109317676236800,
 12302792042521559040000]