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A018916 as a simple table

na(n)
02
18
231
3120
4464
51794
66936
726816
8103676
9400832
101549696
115991432
1223164064
1389556864
14346244592
151338650240
165175487232
1720009459744
1877360538496
19299091179520
201156345798592
214470662117376
2217284466110464
2366825172844672

[2,8,31,120,464,1794,6936,26816,103676,400832,
 1549696,5991432,23164064,89556864,346244592,
 1338650240,5175487232,20009459744,77360538496,
 299091179520,1156345798592,4470662117376,
 17284466110464,66825172844672]