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A086984 as a simple table

na(n)
11
26
360
4696
59120
6134640
72227680
841005440
9833172480
1018546796800
11449223667200
1211766674304000
13331501679308800
149997170543360000
15321355745238528000
1610969253822951424000
17396269940892041216000

[1,6,60,696,9120,134640,2227680,41005440,
 833172480,18546796800,449223667200,11766674304000,
 331501679308800,9997170543360000,
 321355745238528000,10969253822951424000,
 396269940892041216000]