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A218873 as a simple table

na(n)
11
21
32
43
520
6168
725740
81627920
97600186994400
1091351145008363640400
1141220780807793167133364240240011200
1286885947737342403570395603462501113422055643279216000

[1,1,2,3,20,168,25740,1627920,7600186994400,
 91351145008363640400,
 41220780807793167133364240240011200,
 86885947737342403570395603462501113422055643279216\
 000]