A206378 - OEIS

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A206378 as a simple table

n	a(n)
1	641
2	25945
3	1198601
4	57656713
5	2808967145
6	137393517193
7	6728546532521
8	329641979105737
9	16151593118685929
10	791414923478310409
11	38779131391953424169
12	1900174398169760171593
13	93108499268211138032489

[641,25945,1198601,57656713,2808967145, 137393517193,6728546532521,329641979105737, 16151593118685929,791414923478310409, 38779131391953424169,1900174398169760171593, 93108499268211138032489]