A101562 - cp's OEIS frontend

A101562 a(n) = (-1)^n * coefficient of x^n in Sum_{k>=1} x^(k-1)/(1+4*x^k).

n	a(n)
0	1
1	3
2	17
3	67
4	257
5	1011
6	4097
7	16451
8	65553
9	261891
10	1048577
11	4195379
12	16777217
13	67104771
14	268435729
15	1073758275
16	4294967297
17	17179804659
18	68719476737
19	274878168899
20	1099511631889
21	4398045462531
22	17592186044417
23	70368748389427

[1, 3, 17, 67, 257, 1011, 4097, 16451, 65553, 261891, 1048577, 4195379, 16777217, 67104771, 268435729, 1073758275, 4294967297, 17179804659, 68719476737, 274878168899, 1099511631889, 4398045462531, 17592186044417, 70368748389427]

cp's OEIS Frontend

A101562 a(n) = (-1)^n * coefficient of x^n in Sum_{k>=1} x^(k-1)/(1+4*x^k).

Table of values

List of values