A078481 - cp's OEIS frontend

A078481 Expansion of (1 - x - x^2 - sqrt(1 - 2x - 5x^2 - 2x^3 + x^4)) / (2x + 2*x^2).

n	a(n)
0	0
1	1
2	1
3	3
4	7
5	19
6	53
7	153
8	453
9	1367
10	4191
11	13015
12	40857
13	129441
14	413337
15	1328971
16	4298727
17	13978971
18	45673981
19	149867513
20	493638797
21	1631616239
22	5410015615
23	17990076527
24	59981630321
25	200476419713
26	671564145137
27	2254338511507
28	7582179238151
29	25547868961315

[0, 1, 1, 3, 7, 19, 53, 153, 453, 1367, 4191, 13015, 40857, 129441, 413337, 1328971, 4298727, 13978971, 45673981, 149867513, 493638797, 1631616239, 5410015615, 17990076527, 59981630321, 200476419713, 671564145137, 2254338511507, 7582179238151, 25547868961315]

cp's OEIS Frontend

A078481 Expansion of (1 - x - x^2 - sqrt(1 - 2x - 5x^2 - 2x^3 + x^4)) / (2x + 2*x^2).

Table of values

List of values

cp's OEIS Frontend

A078481 Expansion of (1 - x - x^2 - sqrt(1 - 2*x - 5*x^2 - 2*x^3 + x^4)) / (2*x + 2*x^2).

Table of values

List of values

A078481 Expansion of (1 - x - x^2 - sqrt(1 - 2x - 5x^2 - 2x^3 + x^4)) / (2x + 2*x^2).