A067361 - cp's OEIS frontend

A067361 a(n) = 17^ncos(2n*arctan(1/4)) or denominator of tan(2narctan(1/4)).

n	a(n)
1	15
2	161
3	495
4	-31679
5	-1093425
6	-23647519
7	-393425745
8	-4968639359
9	-35359140465
10	375162560801
11	21473668418415
12	535788072480961
13	9867752001506895
14	141189807098209121
15	1383913884510780975
16	713562283940993281
17	-378544244105385903345

[15, 161, 495, -31679, -1093425, -23647519, -393425745, -4968639359, -35359140465, 375162560801, 21473668418415, 535788072480961, 9867752001506895, 141189807098209121, 1383913884510780975, 713562283940993281, -378544244105385903345]

cp's OEIS Frontend

A067361 a(n) = 17^ncos(2n*arctan(1/4)) or denominator of tan(2narctan(1/4)).

Table of values

List of values

cp's OEIS Frontend

A067361 a(n) = 17^n*cos(2*n*arctan(1/4)) or denominator of tan(2*n*arctan(1/4)).

Table of values

List of values

A067361 a(n) = 17^ncos(2n*arctan(1/4)) or denominator of tan(2narctan(1/4)).