A206749 - OEIS

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A206749 as a simple table

n	a(n)
1	1289472
2	415429504
3	140074119984
4	47661729160320
5	16261882009570952
6	5553852508380267184
7	1897470427514439403464
8	648358115933748841946976
9	221552861031935138886277472
10	75709141973478718002175226936

[1289472,415429504,140074119984,47661729160320, 16261882009570952,5553852508380267184, 1897470427514439403464,648358115933748841946976, 221552861031935138886277472, 75709141973478718002175226936]