A114480 - OEIS

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A114480 as a simple table

n	a(n)
1	4
2	50
3	650
4	8500
5	111250
6	1456250
7	19062500
8	249531250
9	3266406250
10	42757812500
11	559707031250
12	7326660156250
13	95907226562500
14	1255441894531250
15	16433947753906250
16	215123168945312500
17	2815998840332031250

[4,50,650,8500,111250,1456250,19062500,249531250, 3266406250,42757812500,559707031250,7326660156250, 95907226562500,1255441894531250,16433947753906250, 215123168945312500,2815998840332031250]