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A064649 as a simple table

na(n)
11
24
312
440
5140
6816
75082
840800
9363258
103632880
1139916910
12479052528
136227020956
1487178936992
151307674429440
1620922800222848
17355687428096272
186402373892575992
19121645100408832342
202432902011892837920

[1,4,12,40,140,816,5082,40800,363258,3632880,
 39916910,479052528,6227020956,87178936992,
 1307674429440,20922800222848,355687428096272,
 6402373892575992,121645100408832342,
 2432902011892837920]