A263988 - OEIS

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A263988 as a simple table

n	a(n)
1	1
2	4
3	64
4	1728
5	104976
6	21870000
7	12656250000
8	16588800000000
9	55662776156160000
10	524753103350661120000
11	13063269877417673072640000
12	823784380246050405868707840000
13	135558605263753575626189314498560000

[1,4,64,1728,104976,21870000,12656250000, 16588800000000,55662776156160000, 524753103350661120000,13063269877417673072640000, 823784380246050405868707840000, 135558605263753575626189314498560000]