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A084939 as a simple table

na(n)
01
11
25
360
41320
546200
62356200
7164934000
815173928000
91775349576000
10257425688520000
1145306921179520000
129514453447699200000
132350070001581702400000
14674470090453948588800000
15222575129849803034304000000

[1,1,5,60,1320,46200,2356200,164934000,
 15173928000,1775349576000,257425688520000,
 45306921179520000,9514453447699200000,
 2350070001581702400000,674470090453948588800000,
 222575129849803034304000000]