A116409 - cp's OEIS frontend

A116409 Expansion of (1-x-2x^2+sqrt(1-2x-3x^2))/(2(1-x)(1-2x-3x^2)).

n	a(n)
0	1
1	2
2	5
3	13
4	36
5	102
6	294
7	855
8	2502
9	7352
10	21670
11	64021
12	189489
13	561680
14	1666955
15	4952243
16	14725010
17	43815836
18	130462322
19	388670993
20	1158491411
21	3454558976
22	10305303341
23	30752447207
24	91798204811
25	274101391202
26	818652308999

[1, 2, 5, 13, 36, 102, 294, 855, 2502, 7352, 21670, 64021, 189489, 561680, 1666955, 4952243, 14725010, 43815836, 130462322, 388670993, 1158491411, 3454558976, 10305303341, 30752447207, 91798204811, 274101391202, 818652308999]

cp's OEIS Frontend

A116409 Expansion of (1-x-2x^2+sqrt(1-2x-3x^2))/(2(1-x)(1-2x-3x^2)).

Table of values

List of values