A121907 - cp's OEIS frontend

A121907 Expansion of g.f.: (1 + x + x^2)/(1 - 2x - 2x^2).

n	a(n)
0	1
1	3
2	9
3	24
4	66
5	180
6	492
7	1344
8	3672
9	10032
10	27408
11	74880
12	204576
13	558912
14	1526976
15	4171776
16	11397504
17	31138560
18	85072128
19	232421376
20	634987008
21	1734816768
22	4739607552
23	12948848640
24	35376912384
25	96651522048
26	264056868864
27	721416781824
28	1970947301376

[1, 3, 9, 24, 66, 180, 492, 1344, 3672, 10032, 27408, 74880, 204576, 558912, 1526976, 4171776, 11397504, 31138560, 85072128, 232421376, 634987008, 1734816768, 4739607552, 12948848640, 35376912384, 96651522048, 264056868864, 721416781824, 1970947301376]

cp's OEIS Frontend

A121907 Expansion of g.f.: (1 + x + x^2)/(1 - 2x - 2x^2).

Table of values

List of values

cp's OEIS Frontend

A121907 Expansion of g.f.: (1 + x + x^2)/(1 - 2*x - 2*x^2).

Table of values

List of values

A121907 Expansion of g.f.: (1 + x + x^2)/(1 - 2x - 2x^2).