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A247894 as a simple table

na(n)
00
11
2724
334091
4524288
54367320
624685212
7106765608
8379625062
91162261467
103162277660
117820427766
1217874003451
1338235066239
1477306558317
15148890490631
16274877906944
17488950340714
18841567195983
191406563064942
202289733608959
213639848436450
225662594565481

[0,1,724,34091,524288,4367320,24685212,106765608,
 379625062,1162261467,3162277660,7820427766,
 17874003451,38235066239,77306558317,148890490631,
 274877906944,488950340714,841567195983,
 1406563064942,2289733608959,3639848436450,
 5662594565481]