A218238 - OEIS

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A218238 as a simple table

n	a(n)
1	15
2	255
3	4095
4	65535
5	1048545
6	16776705
7	268427265
8	4294836225
9	68717379375
10	1099478066175
11	17591648997375
12	281466382974975
13	4503462111871425
14	72055393538292225
15	1152886292586266625
16	18446180616957722625

[15,255,4095,65535,1048545,16776705,268427265, 4294836225,68717379375,1099478066175, 17591648997375,281466382974975,4503462111871425, 72055393538292225,1152886292586266625, 18446180616957722625]