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A083881 as a simple table

na(n)
01
13
212
354
4252
51188
65616
726568
8125712
9594864
102814912
1113320288
1263032256
13298271808
141411437312
156678993024
1631605334272
17149558047488
18707716279296
193348949390848
2015847398669312
2174990695670784
22354859782008832

[1,3,12,54,252,1188,5616,26568,125712,594864,
 2814912,13320288,63032256,298271808,1411437312,
 6678993024,31605334272,149558047488,707716279296,
 3348949390848,15847398669312,74990695670784,
 354859782008832]