A172748 - OEIS

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A172748 as a simple table

n	a(n)
1	1
2	3
3	55
4	8515
5	13130451
6	210668680701
7	36012988082548233
8	68307608848277646753795
9	1469748355306450464225368161315
10	364459290339560650671344361875961740353

[1,3,55,8515,13130451,210668680701, 36012988082548233,68307608848277646753795, 1469748355306450464225368161315, 364459290339560650671344361875961740353]