A279389 - OEIS

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A279389 as a simple table

n	a(n)
1	9
2	21
3	93
4	381
5	24573
6	393213
7	1572861
8	6442450941
9	6917529027641081853
10	1856910058928070412348686333
11	486777830487640090174734030864381
12	510423550381407695195061911147652317181

[9,21,93,381,24573,393213,1572861,6442450941, 6917529027641081853,1856910058928070412348686333, 486777830487640090174734030864381, 510423550381407695195061911147652317181]