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A218899 as a simple table

na(n)
18
216
372
4212
5786
62594
79110
831062
9107510
10369596
111274760
124390640
1315132044
1452139518
15179669784
16619118588
172133406676
187351495186
1925332356634
2087292564824
21300799972600
221036523262982
233571740490936
2412307815695422

[8,16,72,212,786,2594,9110,31062,107510,369596,
 1274760,4390640,15132044,52139518,179669784,
 619118588,2133406676,7351495186,25332356634,
 87292564824,300799972600,1036523262982,
 3571740490936,12307815695422]