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A002446 as a simple table

na(n)
00
16
230
3126
4510
52046
68190
732766
8131070
9524286
102097150
118388606
1233554430
13134217726
14536870910
152147483646
168589934590
1734359738366
18137438953470
19549755813886
202199023255550
218796093022206
2235184372088830

[0,6,30,126,510,2046,8190,32766,131070,524286,
 2097150,8388606,33554430,134217726,536870910,
 2147483646,8589934590,34359738366,137438953470,
 549755813886,2199023255550,8796093022206,
 35184372088830]