A237748 - OEIS

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A237748 as a simple table

n	a(n)
1	4
2	6
3	23
4	496
5	2275974
6	800648638402240
7	1054942853799126580390222487977120
8	22436153203535039105819651040959324360753617244078062654624560815030272

[4,6,23,496,2275974,800648638402240, 1054942853799126580390222487977120, 22436153203535039105819651040959324360753617244078\ 062654624560815030272]