A091140 - cp's OEIS frontend

A091140 a(n) = 2a(n-1) + 4a(n-2) - 2*a(n-3) with initial terms 1, 3, 9.

n	a(n)
1	1
2	3
3	9
4	28
5	86
6	266
7	820
8	2532
9	7812
10	24112
11	74408
12	229640
13	708688
14	2187120
15	6749712
16	20830528
17	64285664
18	198394016
19	612269632
20	1889544000
21	5831378496
22	17996393728
23	55539213440
24	171401244800
25	528966555904
26	1632459664128
27	5037983062272
28	15547871669248

[1, 3, 9, 28, 86, 266, 820, 2532, 7812, 24112, 74408, 229640, 708688, 2187120, 6749712, 20830528, 64285664, 198394016, 612269632, 1889544000, 5831378496, 17996393728, 55539213440, 171401244800, 528966555904, 1632459664128, 5037983062272, 15547871669248]

cp's OEIS Frontend

A091140 a(n) = 2a(n-1) + 4a(n-2) - 2*a(n-3) with initial terms 1, 3, 9.

Table of values

List of values

cp's OEIS Frontend

A091140 a(n) = 2*a(n-1) + 4*a(n-2) - 2*a(n-3) with initial terms 1, 3, 9.

Table of values

List of values

A091140 a(n) = 2a(n-1) + 4a(n-2) - 2*a(n-3) with initial terms 1, 3, 9.