A005712 - cp's OEIS frontend

A005712 Coefficient of x^4 in expansion of (1+x+x^2)^n.

n	a(n)
2	1
3	6
4	19
5	45
6	90
7	161
8	266
9	414
10	615
11	880
12	1221
13	1651
14	2184
15	2835
16	3620
17	4556
18	5661
19	6954
20	8455
21	10185
22	12166
23	14421
24	16974
25	19850
26	23075
27	26676
28	30681
29	35119
30	40020
31	45415
32	51336
33	57816
34	64889
35	72590
36	80955
37	90021
38	99826
39	110409
40	121810
41	134070

[1, 6, 19, 45, 90, 161, 266, 414, 615, 880, 1221, 1651, 2184, 2835, 3620, 4556, 5661, 6954, 8455, 10185, 12166, 14421, 16974, 19850, 23075, 26676, 30681, 35119, 40020, 45415, 51336, 57816, 64889, 72590, 80955, 90021, 99826, 110409, 121810, 134070]

cp's OEIS Frontend

A005712 Coefficient of x^4 in expansion of (1+x+x^2)^n.

Table of values

List of values