A145615 - OEIS

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A145615 as a simple table

n	a(n)
1	18
2	883
3	23566
4	5278979
5	380087174
6	66895348819
7	13914232622662
8	178102177617521
9	4036982692723202
10	6136213692944321089
11	32726473029037904778
12	72260052448115886127009
13	2890402097924635887833902

[18,883,23566,5278979,380087174,66895348819, 13914232622662,178102177617521,4036982692723202, 6136213692944321089,32726473029037904778, 72260052448115886127009,2890402097924635887833902]