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A166858 as a simple table

na(n)
01
14
212
336
4108
5324
6972
72916
88748
926244
1078732
11236196
12708588
132125758
146377256
1519131720
1657395016
17172184616
18516552552
191549653768
204648949640
2113946813928
2241840336808
23125520695496
24376561141704
251129680590760

[1,4,12,36,108,324,972,2916,8748,26244,78732,
 236196,708588,2125758,6377256,19131720,57395016,
 172184616,516552552,1549653768,4648949640,
 13946813928,41840336808,125520695496,376561141704,
 1129680590760]