A011769 - cp's OEIS frontend

A011769 a(0) = 1, a(n+1) = 3 * a(n) - F(n)*(F(n) + 1), where F(n) = A000045(n) is n-th Fibonacci number.

n	a(n)
0	1
1	3
2	7
3	19
4	51
5	141
6	393
7	1107
8	3139
9	8955
10	25675
11	73945
12	213825
13	620595
14	1807263
15	5279283
16	15465139
17	45420261
18	133708777
19	394446691
20	1165855131
21	3451793403
22	10235554347
23	30392965809
24	90357645121
25	268922897571
26	801139867063
27	2388683219347
28	7127469430899

[1, 3, 7, 19, 51, 141, 393, 1107, 3139, 8955, 25675, 73945, 213825, 620595, 1807263, 5279283, 15465139, 45420261, 133708777, 394446691, 1165855131, 3451793403, 10235554347, 30392965809, 90357645121, 268922897571, 801139867063, 2388683219347, 7127469430899]

cp's OEIS Frontend

A011769 a(0) = 1, a(n+1) = 3 * a(n) - F(n)*(F(n) + 1), where F(n) = A000045(n) is n-th Fibonacci number.

Table of values

List of values