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A188326 as a simple table

na(n)
10
22
34
420
586
6424
72128
811200
960372
10333254
111872728
1210688284
1361792756
14361247006
152132290212
1612692489494
1776115308712
18459476777038
192790092370660
2017032567789840
21104478722395496
22643682329681246
233981493201581658

[0,2,4,20,86,424,2128,11200,60372,333254,1872728,
 10688284,61792756,361247006,2132290212,
 12692489494,76115308712,459476777038,
 2790092370660,17032567789840,104478722395496,
 643682329681246,3981493201581658]