A131665 - cp's OEIS frontend

A131665 Sequence is identical to its third differences in absolute value: a(0), a(1), a(2), a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), with a(0)=a(1)=0, a(2)=1.

n	a(n)
0	0
1	0
2	1
3	3
4	6
5	11
6	15
7	24
8	27
9	39
10	36
11	45
12	27
13	18
14	-27
15	-81
16	-162
17	-297
18	-405
19	-648
20	-729
21	-1053
22	-972
23	-1215
24	-729
25	-486
26	729
27	2187
28	4374
29	8019
30	10935
31	17496
32	19683
33	28431
34	26244
35	32805
36	19683
37	13122
38	-19683
39	-59049
40	-118098
41	-216513
42	-295245
43	-472392

[0, 0, 1, 3, 6, 11, 15, 24, 27, 39, 36, 45, 27, 18, -27, -81, -162, -297, -405, -648, -729, -1053, -972, -1215, -729, -486, 729, 2187, 4374, 8019, 10935, 17496, 19683, 28431, 26244, 32805, 19683, 13122, -19683, -59049, -118098, -216513, -295245, -472392]

cp's OEIS Frontend

A131665 Sequence is identical to its third differences in absolute value: a(0), a(1), a(2), a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), with a(0)=a(1)=0, a(2)=1.

Table of values

List of values