A132552 - OEIS

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A132552 as a simple table

n	a(n)
1	4
2	45
3	2292
4	6277418
5	103871725186306
6	81008736142582610506999643966
7	23539965680127834509371928343137420934355534574054408258135

[4,45,2292,6277418,103871725186306, 81008736142582610506999643966, 23539965680127834509371928343137420934355534574054\ 408258135]