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A000681 as a simple table

na(n)
01
11
23
321
4282
56210
6202410
79135630
8545007960
941514583320
103930730108200
11452785322266200
1262347376347779600
1310112899541133589200
141908371363842760216400
15414517594539154672566000
16102681435747106627787376000
1728772944645196614863048048000

[1,1,3,21,282,6210,202410,9135630,545007960,
 41514583320,3930730108200,452785322266200,
 62347376347779600,10112899541133589200,
 1908371363842760216400,414517594539154672566000,
 102681435747106627787376000,
 28772944645196614863048048000]