A198281 - OEIS

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A198281 as a simple table

n	a(n)
1	4
2	52
3	662
4	8784
5	112750
6	1478756
7	19399132
8	254611868
9	3341562350
10	43867978456
11	575917076750
12	7560973295748
13	99265283146820
14	1303224636522612
15	17109671915393798
16	224628189063611744
17	2949082376664452782

[4,52,662,8784,112750,1478756,19399132,254611868, 3341562350,43867978456,575917076750,7560973295748, 99265283146820,1303224636522612,17109671915393798, 224628189063611744,2949082376664452782]