A136676 - OEIS

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A136676 as a simple table

n	a(n)
1	1
2	31
3	7565
4	241837
5	755989457
6	755889457
7	12705011703799
8	406547611705943
9	98792790681344149
10	98791774426324117
11	15910615688635928566967
12	15910549913780913466967
13	5907492176026179821253778331

[1,31,7565,241837,755989457,755889457, 12705011703799,406547611705943,98792790681344149, 98791774426324117,15910615688635928566967, 15910549913780913466967, 5907492176026179821253778331]