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A086891 as a simple table

na(n)
11
24
38
464
5640
62560
735840
8114688
9688128
1013762560
1114417920
12346030080
131799356416
142399141888
1523991418880
16767725404160
172372969431040
185695126634496
19216414812110848
20221963909857280
219322484214005760

[1,4,8,64,640,2560,35840,114688,688128,13762560,
 14417920,346030080,1799356416,2399141888,
 23991418880,767725404160,2372969431040,
 5695126634496,216414812110848,221963909857280,
 9322484214005760]