A309874 - cp's OEIS frontend

A309874 a(n) = 2nFibonacci(n-2) + (-1)^n + 1.

n	a(n)
2	2
3	6
4	10
5	20
6	38
7	70
8	130
9	234
10	422
11	748
12	1322
13	2314
14	4034
15	6990
16	12066
17	20740
18	35534
19	60686
20	103362
21	175602
22	297662
23	503516
24	850130
25	1432850
26	2411138
27	4051350
28	6798010
29	11392244
30	19068662
31	31882198
32	53250562
33	88853754
34	148125014

[2, 6, 10, 20, 38, 70, 130, 234, 422, 748, 1322, 2314, 4034, 6990, 12066, 20740, 35534, 60686, 103362, 175602, 297662, 503516, 850130, 1432850, 2411138, 4051350, 6798010, 11392244, 19068662, 31882198, 53250562, 88853754, 148125014]

cp's OEIS Frontend

A309874 a(n) = 2nFibonacci(n-2) + (-1)^n + 1.

Table of values

List of values

cp's OEIS Frontend

A309874 a(n) = 2*n*Fibonacci(n-2) + (-1)^n + 1.

Table of values

List of values

A309874 a(n) = 2nFibonacci(n-2) + (-1)^n + 1.