A001871 - cp's OEIS frontend

A001871 Expansion of 1/(1 - 3*x + x^2)^2.

n	a(n)
0	1
1	6
2	25
3	90
4	300
5	954
6	2939
7	8850
8	26195
9	76500
10	221016
11	632916
12	1799125
13	5082270
14	14279725
15	39935214
16	111228804
17	308681550
18	853904015
19	2355364650
20	6480104231
21	17786356776
22	48715278000
23	133167004200
24	363372003625
25	989900286774

[1, 6, 25, 90, 300, 954, 2939, 8850, 26195, 76500, 221016, 632916, 1799125, 5082270, 14279725, 39935214, 111228804, 308681550, 853904015, 2355364650, 6480104231, 17786356776, 48715278000, 133167004200, 363372003625, 989900286774]

cp's OEIS Frontend

A001871 Expansion of 1/(1 - 3*x + x^2)^2.

Table of values

List of values