A001870 - cp's OEIS frontend

A001870 Expansion of (1-x)/(1 - 3*x + x^2)^2.

n	a(n)
0	1
1	5
2	19
3	65
4	210
5	654
6	1985
7	5911
8	17345
9	50305
10	144516
11	411900
12	1166209
13	3283145
14	9197455
15	25655489
16	71293590
17	197452746
18	545222465
19	1501460635
20	4124739581
21	11306252545
22	30928921224
23	84451726200
24	230204999425

[1, 5, 19, 65, 210, 654, 1985, 5911, 17345, 50305, 144516, 411900, 1166209, 3283145, 9197455, 25655489, 71293590, 197452746, 545222465, 1501460635, 4124739581, 11306252545, 30928921224, 84451726200, 230204999425]

cp's OEIS Frontend

A001870 Expansion of (1-x)/(1 - 3*x + x^2)^2.

Table of values

List of values