A099489 - cp's OEIS frontend

A099489 Expansion of (1-x+x^2)/((1+x^2)(1-4x+x^2)).

n	a(n)
0	1
1	3
2	11
3	42
4	157
5	585
6	2183
7	8148
8	30409
9	113487
10	423539
11	1580670
12	5899141
13	22015893
14	82164431
15	306641832
16	1144402897
17	4270969755
18	15939476123
19	59486934738
20	222008262829
21	828546116577
22	3092176203479
23	11540158697340

[1, 3, 11, 42, 157, 585, 2183, 8148, 30409, 113487, 423539, 1580670, 5899141, 22015893, 82164431, 306641832, 1144402897, 4270969755, 15939476123, 59486934738, 222008262829, 828546116577, 3092176203479, 11540158697340]

cp's OEIS Frontend

A099489 Expansion of (1-x+x^2)/((1+x^2)(1-4x+x^2)).

Table of values

List of values