A172637 - OEIS

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A172637 as a simple table

n	a(n)
1	1
2	8953
3	8710537
4	30189264889
5	101471705778601
6	431222728237019041
7	1998635481349606292593
8	10132345044562368521279737
9	54649595712626140857519780409
10	310419652143758898175543447421953

[1,8953,8710537,30189264889,101471705778601, 431222728237019041,1998635481349606292593, 10132345044562368521279737, 54649595712626140857519780409, 310419652143758898175543447421953]