A271944 - cp's OEIS frontend

A271944 Expansion of 2x(1 + x)/(1 - x - 9*x^2 + x^3).

n	a(n)
0	0
1	2
2	4
3	22
4	56
5	250
6	732
7	2926
8	9264
9	34866
10	115316
11	419846
12	1422824
13	5086122
14	17471692
15	61823966
16	213983072
17	752927074
18	2616950756
19	9179311350
20	31978941080
21	111975792474
22	390606950844
23	1366410142030
24	4769896907152
25	16676981234578
26	58239643256916

[0, 2, 4, 22, 56, 250, 732, 2926, 9264, 34866, 115316, 419846, 1422824, 5086122, 17471692, 61823966, 213983072, 752927074, 2616950756, 9179311350, 31978941080, 111975792474, 390606950844, 1366410142030, 4769896907152, 16676981234578, 58239643256916]

cp's OEIS Frontend

A271944 Expansion of 2x(1 + x)/(1 - x - 9*x^2 + x^3).

Table of values

List of values

cp's OEIS Frontend

A271944 Expansion of 2*x*(1 + x)/(1 - x - 9*x^2 + x^3).

Table of values

List of values

A271944 Expansion of 2x(1 + x)/(1 - x - 9*x^2 + x^3).