A102129 - cp's OEIS frontend

A102129 Expansion of (1 - x)(1 + 2x) / ((1 + x)(1 - 4x - x^2)).

n	a(n)
0	1
1	4
2	15
3	66
4	277
5	1176
6	4979
7	21094
8	89353
9	378508
10	1603383
11	6792042
12	28771549
13	121878240
14	516284507
15	2187016270
16	9264349585
17	39244414612
18	166242008031
19	704212446738
20	2983091794981
21	12636579626664
22	53529410301635
23	226754220833206
24	960546293634457

[1, 4, 15, 66, 277, 1176, 4979, 21094, 89353, 378508, 1603383, 6792042, 28771549, 121878240, 516284507, 2187016270, 9264349585, 39244414612, 166242008031, 704212446738, 2983091794981, 12636579626664, 53529410301635, 226754220833206, 960546293634457]

cp's OEIS Frontend

A102129 Expansion of (1 - x)(1 + 2x) / ((1 + x)(1 - 4x - x^2)).

Table of values

List of values

cp's OEIS Frontend

A102129 Expansion of (1 - x)*(1 + 2*x) / ((1 + x)*(1 - 4*x - x^2)).

Table of values

List of values

A102129 Expansion of (1 - x)(1 + 2x) / ((1 + x)(1 - 4x - x^2)).