A075112 - cp's OEIS frontend

A075112 a(n)=Sum((-1)^(i+Floor(n/2))S(2i+e),(i=0,..,Floor(n/2))), where S(n) are generalized Tetranacci numbers (A073817) and e=(1/2)(1-(-1)^n).

n	a(n)
0	4
1	1
2	-1
3	6
4	16
5	20
6	35
7	79
8	156
9	288
10	552
11	1077
12	2079
13	3994
14	7696
15	14848
16	28623
17	55159
18	106320
19	204952
20	395060
21	761489
22	1467815
23	2829318
24	5453688
25	10512308
26	20263123
27	39058439
28	75287564
29	145121432
30	279730552
31	539197989
32	1039337543
33	2003387514
34	3861653592
35	7443576640
36	14347955295

[4, 1, -1, 6, 16, 20, 35, 79, 156, 288, 552, 1077, 2079, 3994, 7696, 14848, 28623, 55159, 106320, 204952, 395060, 761489, 1467815, 2829318, 5453688, 10512308, 20263123, 39058439, 75287564, 145121432, 279730552, 539197989, 1039337543, 2003387514, 3861653592, 7443576640, 14347955295]

cp's OEIS Frontend

A075112 a(n)=Sum((-1)^(i+Floor(n/2))S(2i+e),(i=0,..,Floor(n/2))), where S(n) are generalized Tetranacci numbers (A073817) and e=(1/2)(1-(-1)^n).

Table of values

List of values