A123620 - cp's OEIS frontend

A123620 Expansion of (1 + x + x^2) / (1 - 3x - 3x^2).

n	a(n)
0	1
1	4
2	16
3	60
4	228
5	864
6	3276
7	12420
8	47088
9	178524
10	676836
11	2566080
12	9728748
13	36884484
14	139839696
15	530172540
16	2010036708
17	7620627744
18	28891993356
19	109537863300
20	415289569968
21	1574482299804
22	5969315609316
23	22631393727360
24	85802128010028
25	325300565212164

[1, 4, 16, 60, 228, 864, 3276, 12420, 47088, 178524, 676836, 2566080, 9728748, 36884484, 139839696, 530172540, 2010036708, 7620627744, 28891993356, 109537863300, 415289569968, 1574482299804, 5969315609316, 22631393727360, 85802128010028, 325300565212164]

cp's OEIS Frontend

A123620 Expansion of (1 + x + x^2) / (1 - 3x - 3x^2).

Table of values

List of values

cp's OEIS Frontend

A123620 Expansion of (1 + x + x^2) / (1 - 3*x - 3*x^2).

Table of values

List of values

A123620 Expansion of (1 + x + x^2) / (1 - 3x - 3x^2).