A124265 - OEIS

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A124265 as a simple table

n	a(n)
1	3
2	3
3	11
4	27
5	162
6	380
7	7650
8	17325
9	81340
10	2518992
11	91128240
12	424947600
13	14078156400
14	33300661680
15	424624548348

[3,3,11,27,162,380,7650,17325,81340,2518992, 91128240,424947600,14078156400,33300661680, 424624548348]