A067422 - OEIS

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A067422 as a simple table

n	a(n)
0	1
1	9
2	189
3	3969
4	83349
5	1750329
6	36756909
7	771895089
8	16209796869
9	340405734249
10	7148520419229
11	150118928803809
12	3152497504879989
13	66202447602479769
14	1390251399652075149
15	29195279392693578129

[1,9,189,3969,83349,1750329,36756909,771895089, 16209796869,340405734249,7148520419229, 150118928803809,3152497504879989, 66202447602479769,1390251399652075149, 29195279392693578129]