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A006657 as a simple table

na(n)
22
312
484
5640
65236
745164
8406012
93772008
1035994184
11351173328
123490681428
1335253449296
14360946635312
153739935635756
1639159200588780
17413836299216608
184409705753032648
1947337525317450816
20511563350415103008

[2,12,84,640,5236,45164,406012,3772008,35994184,
 351173328,3490681428,35253449296,360946635312,
 3739935635756,39159200588780,413836299216608,
 4409705753032648,47337525317450816,
 511563350415103008]