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A279258 as a simple table

na(n)
01
11
22
36
48
5120
680
75040
813440
9362880
101209600
1139916800
1253222400
13566092800
1429059430400
151307674368000
166974263296000
17355687428096000
18237124952064000
19121645100408832000
2073724303278080000
2151090942171709440000
2219719311013642240000

[1,1,2,6,8,120,80,5040,13440,362880,1209600,
 39916800,53222400,566092800,29059430400,
 1307674368000,6974263296000,355687428096000,
 237124952064000,121645100408832000,
 73724303278080000,51090942171709440000,
 19719311013642240000]