A069961 - cp's OEIS frontend

A069961 Define C(n) by the recursion C(0) = 4i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 4(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.

n	a(n)
0	1
1	17
2	20
3	73
4	169
5	464
6	1193
7	3145
8	8212
9	21521
10	56321
11	147472
12	386065
13	1010753
14	2646164
15	6927769
16	18137113
17	47483600
18	124313657
19	325457401
20	852058516
21	2230718177
22	5840095985
23	15289569808
24	40028613409
25	104796270449
26	274360197908
27	718284323305
28	1880492771977

[1, 17, 20, 73, 169, 464, 1193, 3145, 8212, 21521, 56321, 147472, 386065, 1010753, 2646164, 6927769, 18137113, 47483600, 124313657, 325457401, 852058516, 2230718177, 5840095985, 15289569808, 40028613409, 104796270449, 274360197908, 718284323305, 1880492771977]

cp's OEIS Frontend

A069961 Define C(n) by the recursion C(0) = 4i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 4(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.

Table of values

List of values

cp's OEIS Frontend

A069961 Define C(n) by the recursion C(0) = 4*i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 4*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.

Table of values

List of values

A069961 Define C(n) by the recursion C(0) = 4i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 4(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.