A016991 - OEIS

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A016991 as a simple table

n	a(n)
0	0
1	1977326743
2	4049565169664
3	350277500542221
4	8293509467471872
5	96549157373046875
6	717368321110468608
7	3909821048582988049
8	16985107389382393856
9	62050608388552823487
10	197732674300000000000

[0,1977326743,4049565169664,350277500542221, 8293509467471872,96549157373046875, 717368321110468608,3909821048582988049, 16985107389382393856,62050608388552823487, 197732674300000000000]