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A003774 as a simple table

na(n)
14
248
3672
48496
5106944
61349760
717032800
8214925952
92712031104
1034221651456
11431824387584
125448956749824
1368757417818112
14867612411420672
1510947928532312064
16138145948088696832

[4,48,672,8496,106944,1349760,17032800,214925952,
 2712031104,34221651456,431824387584,5448956749824,
 68757417818112,867612411420672,10947928532312064,
 138145948088696832]