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A212432 as a simple table

na(n)
01
11
22
34
416
584
6536
73912
832256
9297072
103026112
1133798720
12410826624
135399704320
1476317546240
151154312486400
1618604815528960
17318348065548800
185763746405053440
19110086912964367360
202212209395234979840
2146657233031296706560
221030510550216174469120

[1,1,2,4,16,84,536,3912,32256,297072,3026112,
 33798720,410826624,5399704320,76317546240,
 1154312486400,18604815528960,318348065548800,
 5763746405053440,110086912964367360,
 2212209395234979840,46657233031296706560,
 1030510550216174469120]