A271726 - cp's OEIS frontend

A271726 Let f(x) = 1 -x^3+ Sum_{j>=2} (x^(2^j)-x^(1+2^j)). Then a(n) is n times the coefficient of x^n in the expansion of log(f(x)).

n	a(n)
1	0
2	0
3	-3
4	4
5	-5
6	-3
7	7
8	-4
9	-3
10	5
11	-11
12	1
13	13
14	-21
15	7
16	28
17	-51
18	33
19	19
20	-91
21	109
22	-33
23	-115
24	209
25	-155
26	-65
27	321
28	-381
29	87
30	407
31	-713
32	476
33	349
34	-1207
35	1227
36	-35
37	-1739
38	2603
39	-1277
40	-1979
41	4797
42	-4161
43	-903
44	7451
45	-9713
46	3427
47	9165
48	-18575
49	14021
50	6455
51	-29991
52	34779

[0, 0, -3, 4, -5, -3, 7, -4, -3, 5, -11, 1, 13, -21, 7, 28, -51, 33, 19, -91, 109, -33, -115, 209, -155, -65, 321, -381, 87, 407, -713, 476, 349, -1207, 1227, -35, -1739, 2603, -1277, -1979, 4797, -4161, -903, 7451, -9713, 3427, 9165, -18575, 14021, 6455, -29991, 34779]

cp's OEIS Frontend

A271726 Let f(x) = 1 -x^3+ Sum_{j>=2} (x^(2^j)-x^(1+2^j)). Then a(n) is n times the coefficient of x^n in the expansion of log(f(x)).

Table of values

List of values