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A018968 as a simple table

na(n)
23
37
441
5184
6802
74763
830995
9198601
101284125
118389360
1255733690
13375706748
142554513453
1517469639322
16120124786243

[3,7,41,184,802,4763,30995,198601,1284125,8389360,
 55733690,375706748,2554513453,17469639322,
 120124786243]