A154307 - OEIS

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A154307 as a simple table

n	a(n)
0	1
1	80
2	2430
3	53760
4	1050000
5	19595520
6	363031200
7	6812467200
8	130947062400
9	2594592000000
10	53182390060800
11	1129830653952000
12	24898991749632000
13	569337009905664000
14	13505007035520000000
15	332172220849717248000

[1,80,2430,53760,1050000,19595520,363031200, 6812467200,130947062400,2594592000000, 53182390060800,1129830653952000,24898991749632000, 569337009905664000,13505007035520000000, 332172220849717248000]