A069959 - cp's OEIS frontend

A069959 Define C(n) by the recursion C(0) = 2i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 2(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.

n	a(n)
0	1
1	5
2	8
3	25
4	61
5	164
6	425
7	1117
8	2920
9	7649
10	20021
11	52420
12	137233
13	359285
14	940616
15	2462569
16	6447085
17	16878692
18	44188985
19	115688269
20	302875816
21	792939185
22	2075941733
23	5434886020
24	14228716321
25	37251262949
26	97525072520
27	255323954617
28	668446791325
29	1750016419364

[1, 5, 8, 25, 61, 164, 425, 1117, 2920, 7649, 20021, 52420, 137233, 359285, 940616, 2462569, 6447085, 16878692, 44188985, 115688269, 302875816, 792939185, 2075941733, 5434886020, 14228716321, 37251262949, 97525072520, 255323954617, 668446791325, 1750016419364]

cp's OEIS Frontend

A069959 Define C(n) by the recursion C(0) = 2i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 2(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.

Table of values

List of values

cp's OEIS Frontend

A069959 Define C(n) by the recursion C(0) = 2*i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 2*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.

Table of values

List of values

A069959 Define C(n) by the recursion C(0) = 2i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 2(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.