A068748 - OEIS

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A068748 as a simple table

n	a(n)
1	1
2	19
3	1665
4	690437
5	1366395515
6	12961320464027
7	590771311004409091
8	129585582154154757804255
9	136932044780329080616264070553
10	697547669137459516115242710064880165

[1,19,1665,690437,1366395515,12961320464027, 590771311004409091,129585582154154757804255, 136932044780329080616264070553, 697547669137459516115242710064880165]