A026551 - cp's OEIS frontend

A026551 Expansion of 3(1+2x-2x^2)/((1-x)(1-6*x^2)).

n	a(n)
0	3
1	9
2	21
3	57
4	129
5	345
6	777
7	2073
8	4665
9	12441
10	27993
11	74649
12	167961
13	447897
14	1007769
15	2687385
16	6046617
17	16124313
18	36279705
19	96745881
20	217678233
21	580475289
22	1306069401
23	3482851737
24	7836416409
25	20897110425
26	47018498457

[3, 9, 21, 57, 129, 345, 777, 2073, 4665, 12441, 27993, 74649, 167961, 447897, 1007769, 2687385, 6046617, 16124313, 36279705, 96745881, 217678233, 580475289, 1306069401, 3482851737, 7836416409, 20897110425, 47018498457]

cp's OEIS Frontend

A026551 Expansion of 3(1+2x-2x^2)/((1-x)(1-6*x^2)).

Table of values

List of values

cp's OEIS Frontend

A026551 Expansion of 3*(1+2*x-2*x^2)/((1-x)*(1-6*x^2)).

Table of values

List of values

A026551 Expansion of 3(1+2x-2x^2)/((1-x)(1-6*x^2)).