A208870 - OEIS

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A208870 as a simple table

n	a(n)
1	187
2	334618
3	683903931
4	1404920207834
5	2887736845657700
6	5935974611645510227
7	12201956787655438957014
8	25082292111547260024518313
9	51559059416667161930347967813
10	105984596999356698511898369562313

[187,334618,683903931,1404920207834, 2887736845657700,5935974611645510227, 12201956787655438957014, 25082292111547260024518313, 51559059416667161930347967813, 105984596999356698511898369562313]