A006524 - OEIS

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A006524 as a simple table

n	a(n)
1	4
2	15
3	609
4	845029
5	1010073215739
6	1300459886313272270974271
7	1939680952094609786557359582286462958434022504402

[4,15,609,845029,1010073215739, 1300459886313272270974271, 1939680952094609786557359582286462958434022504402]