A180399 - cp's OEIS frontend

A180399 Expansion of (1/3)(1 - (1-9x-9*x^2)^(1/3)).

n	a(n)
0	0
1	1
2	4
3	21
4	138
5	999
6	7683
7	61542
8	507663
9	4281849
10	36748998
11	319845591
12	2816007714
13	25032803841
14	224355173193
15	2024955168606
16	18388543939947
17	167882583075453
18	1540000362501702
19	14186252492098011
20	131176523761136568
21	1217094112710349731
22	11327464549934673309

[0, 1, 4, 21, 138, 999, 7683, 61542, 507663, 4281849, 36748998, 319845591, 2816007714, 25032803841, 224355173193, 2024955168606, 18388543939947, 167882583075453, 1540000362501702, 14186252492098011, 131176523761136568, 1217094112710349731, 11327464549934673309]

cp's OEIS Frontend

A180399 Expansion of (1/3)(1 - (1-9x-9*x^2)^(1/3)).

Table of values

List of values

cp's OEIS Frontend

A180399 Expansion of (1/3)*(1 - (1-9*x-9*x^2)^(1/3)).

Table of values

List of values

A180399 Expansion of (1/3)(1 - (1-9x-9*x^2)^(1/3)).