A252740 - OEIS

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A252740 as a simple table

n	a(n)
0	1
1	2
2	6
3	180
4	1134000
5	3465651420000000
6	356414438712215830124178000000000000000
7	1311750338118625705168608107387873609070899443110750355586669940000000000000000000000000000000

[1,2,6,180,1134000,3465651420000000, 356414438712215830124178000000000000000, 13117503381186257051686081073878736090708994431107\ 50355586669940000000000000000000000000000000]