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A018983 as a simple table

na(n)
22
36
435
5160
61026
76251
839860
9258021
101710770
1111553916
1278929862
13546477542
143822747838
1526980876665
16191958821704

[2,6,35,160,1026,6251,39860,258021,1710770,
 11553916,78929862,546477542,3822747838,
 26980876665,191958821704]