A283038 - OEIS

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A283038 as a simple table

n	a(n)
1	2
2	68
3	818
4	9152
5	94368
6	931844
7	8912378
8	83420984
9	767704036
10	6973000128
11	62669779812
12	558371394860
13	4938938283902
14	43417600038648
15	379661067157816
16	3304658457345168
17	28648616561102224
18	247474652799713212

[2,68,818,9152,94368,931844,8912378,83420984, 767704036,6973000128,62669779812,558371394860, 4938938283902,43417600038648,379661067157816, 3304658457345168,28648616561102224, 247474652799713212]