A109220 - cp's OEIS frontend

A109220 Expansion of (1+x-x^2)/(1-2x-2x^2+x^4).

n	a(n)
0	1
1	3
2	7
3	20
4	53
5	143
6	385
7	1036
8	2789
9	7507
10	20207
11	54392
12	146409
13	394095
14	1060801
15	2855400
16	7685993
17	20688691
18	55688567
19	149899116
20	403489373
21	1086088287
22	2923466753
23	7869210964
24	21181866061
25	57016065763
26	153472396895

[1, 3, 7, 20, 53, 143, 385, 1036, 2789, 7507, 20207, 54392, 146409, 394095, 1060801, 2855400, 7685993, 20688691, 55688567, 149899116, 403489373, 1086088287, 2923466753, 7869210964, 21181866061, 57016065763, 153472396895]

cp's OEIS Frontend

A109220 Expansion of (1+x-x^2)/(1-2x-2x^2+x^4).

Table of values

List of values