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A280982 as a simple table

na(n)
11
21
32
46
554
6486
79720
8204120
96531840
10241678080
1113050616320
12652530816000
1350244872832000
144069834699392000
15390704131141632000
1641023933769871360000
175538231058932633600000
18731046499779107635200000
19124277904962448297984000000

[1,1,2,6,54,486,9720,204120,6531840,241678080,
 13050616320,652530816000,50244872832000,
 4069834699392000,390704131141632000,
 41023933769871360000,5538231058932633600000,
 731046499779107635200000,
 124277904962448297984000000]