A009989 - OEIS

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A009989 as a simple table

n	a(n)
0	1
1	45
2	2025
3	91125
4	4100625
5	184528125
6	8303765625
7	373669453125
8	16815125390625
9	756680642578125
10	34050628916015625
11	1532278301220703125
12	68952523554931640625
13	3102863559971923828125
14	139628860198736572265625

[1,45,2025,91125,4100625,184528125,8303765625, 373669453125,16815125390625,756680642578125, 34050628916015625,1532278301220703125, 68952523554931640625,3102863559971923828125, 139628860198736572265625]