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A045993 as a simple table

na(n)
01
19
272
3566
44436
534748
6272160
72131624
816695344
9130761488
101024151680
118021372768
1262825089344
13492059397056
143853913344512
1530184665012864
16236412685103872
171851634187563264
1814502390863865856
19113585794743350784

[1,9,72,566,4436,34748,272160,2131624,16695344,
 130761488,1024151680,8021372768,62825089344,
 492059397056,3853913344512,30184665012864,
 236412685103872,1851634187563264,
 14502390863865856,113585794743350784]