A203747 - OEIS

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A203747 as a simple table

n	a(n)
1	2
2	25
3	1300
4	666536
5	1866588100
6	40227366213200
7	5615962423683300000
8	5515452582144085933300000
9	36695607554641784976763692852800
10	1681984849693348507666402129737211600000

[2,25,1300,666536,1866588100,40227366213200, 5615962423683300000,5515452582144085933300000, 36695607554641784976763692852800, 1681984849693348507666402129737211600000]