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A018953 as a simple table

na(n)
22
36
434
5217
61092
76616
839640
9254593
101678272
1111264666
1277021822
13533716317
143728816166
1526255378070
16186191393010

[2,6,34,217,1092,6616,39640,254593,1678272,
 11264666,77021822,533716317,3728816166,
 26255378070,186191393010]