A080973 - OEIS

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A080973 as a simple table

n	a(n)
0	2
1	52
2	14952
3	4007632
4	268874213792
5	68836555442592
6	4561331969745081152
7	300550070677246403229312
8	1294530259719904904564091957759232
9	331402554328705507772604330809117952

[2,52,14952,4007632,268874213792,68836555442592, 4561331969745081152,300550070677246403229312, 1294530259719904904564091957759232, 331402554328705507772604330809117952]