A191273 - OEIS

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A191273 as a simple table

n	a(n)
1	1
2	4
3	9
4	25
5	168
6	1360
7	12423
8	197679
9	4404447
10	124898323
11	5318804048
12	324994451931
13	26856733887752
14	3172635060583667
15	535764786560787509
16	125858757883842762915
17	41716808217942795412293

[1,4,9,25,168,1360,12423,197679,4404447,124898323, 5318804048,324994451931,26856733887752, 3172635060583667,535764786560787509, 125858757883842762915,41716808217942795412293]