A081476 - cp's OEIS frontend

A081476 Consider the mapping f(x/y) = (x+y)/(2xy) where x/y is a reduced fraction. Beginning with x_0 = 1 and y_0 = 2, repeated application of this mapping produces a sequence of fractions x_n/y_n; a(n) is the n-th denominator.

n	a(n)
0	2
1	4
2	24
3	336
4	20832
5	15290688
6	648294589824
7	19853227004192875776
8	25742087295468908558449985705472
9	1022127038655087543318858397597063429079854268617728

[2, 4, 24, 336, 20832, 15290688, 648294589824, 19853227004192875776, 25742087295468908558449985705472, 1022127038655087543318858397597063429079854268617728]

cp's OEIS Frontend

A081476 Consider the mapping f(x/y) = (x+y)/(2xy) where x/y is a reduced fraction. Beginning with x_0 = 1 and y_0 = 2, repeated application of this mapping produces a sequence of fractions x_n/y_n; a(n) is the n-th denominator.

Table of values

List of values