A248435 - cp's OEIS frontend

A248435 Number of length 2+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.

n	a(n)
1	2
2	9
3	20
4	45
5	70
6	105
7	140
8	189
9	242
10	301
11	360
12	437
13	514
14	597
15	684
16	785
17	886
18	997
19	1108
20	1233
21	1362
22	1497
23	1632
24	1785
25	1938
26	2097
27	2260
28	2437
29	2614
30	2801
31	2988
32	3189
33	3394
34	3605
35	3816
36	4045
37	4274
38	4509
39	4748
40	5001
41	5254
42	5517
43	5780
44	6057
45	6338
46	6625
47	6912

[2, 9, 20, 45, 70, 105, 140, 189, 242, 301, 360, 437, 514, 597, 684, 785, 886, 997, 1108, 1233, 1362, 1497, 1632, 1785, 1938, 2097, 2260, 2437, 2614, 2801, 2988, 3189, 3394, 3605, 3816, 4045, 4274, 4509, 4748, 5001, 5254, 5517, 5780, 6057, 6338, 6625, 6912]

cp's OEIS Frontend

A248435 Number of length 2+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.

Table of values

List of values