A162830 - OEIS

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A162830 as a simple table

n	a(n)
0	1
1	28
2	756
3	20034
4	530712
5	14054040
6	372171618
7	9855587196
8	260988761124
9	6911320818402
10	183020737961880
11	4846626473132808
12	128344953881202786
13	3398740810188105564
14	90003063973732401492
15	2383397845569631005570

[1,28,756,20034,530712,14054040,372171618, 9855587196,260988761124,6911320818402, 183020737961880,4846626473132808, 128344953881202786,3398740810188105564, 90003063973732401492,2383397845569631005570]