A026581 - cp's OEIS frontend

A026581 Expansion of (1 + 2x) / (1 - x - 4x^2).

n	a(n)
0	1
1	3
2	7
3	19
4	47
5	123
6	311
7	803
8	2047
9	5259
10	13447
11	34483
12	88271
13	226203
14	579287
15	1484099
16	3801247
17	9737643
18	24942631
19	63893203
20	163663727
21	419236539
22	1073891447
23	2750837603
24	7046403391
25	18049753803
26	46235367367
27	118434382579
28	303375852047
29	777113382363

[1, 3, 7, 19, 47, 123, 311, 803, 2047, 5259, 13447, 34483, 88271, 226203, 579287, 1484099, 3801247, 9737643, 24942631, 63893203, 163663727, 419236539, 1073891447, 2750837603, 7046403391, 18049753803, 46235367367, 118434382579, 303375852047, 777113382363]

cp's OEIS Frontend

A026581 Expansion of (1 + 2x) / (1 - x - 4x^2).

Table of values

List of values

cp's OEIS Frontend

A026581 Expansion of (1 + 2*x) / (1 - x - 4*x^2).

Table of values

List of values

A026581 Expansion of (1 + 2x) / (1 - x - 4x^2).