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A027433 as a simple table

na(n)
00
12
218
3116
4646
53324
616302
777356
8358424
91630988
107317424
1132458400
12142638568
13621948448
142693978986
1511602817444
1649726594628
17212195409348
18902038055526
193821542566420
2016141064174876
2167988725603820
22285670814425030
231197613640781032
245010423893820844

[0,2,18,116,646,3324,16302,77356,358424,1630988,
 7317424,32458400,142638568,621948448,2693978986,
 11602817444,49726594628,212195409348,902038055526,
 3821542566420,16141064174876,67988725603820,
 285670814425030,1197613640781032,5010423893820844]