A084594 - OEIS

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A084594 as a simple table

n	a(n)
0	1
1	4
2	28
3	1552
4	4817152
5	46409906716672
6	4307758882900393634270543872
7	37113573186414494550922197215584520229965687291643953152

[1,4,28,1552,4817152,46409906716672, 4307758882900393634270543872, 37113573186414494550922197215584520229965687291643\ 953152]