A138574 - cp's OEIS frontend

A138574 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=3, a(3)=9, a(4)=25.

n	a(n)
0	0
1	1
2	3
3	9
4	25
5	73
6	211
7	609
8	1761
9	5089
10	14707
11	42505
12	122841
13	355017
14	1026019
15	2965249
16	8569729
17	24766977
18	71577891
19	206863945
20	597847897
21	1727812489
22	4993470771
23	14431398369
24	41707515361
25	120536956513
26	348358269715
27	1006774084809
28	2909631106713
29	8408989965961

[0, 1, 3, 9, 25, 73, 211, 609, 1761, 5089, 14707, 42505, 122841, 355017, 1026019, 2965249, 8569729, 24766977, 71577891, 206863945, 597847897, 1727812489, 4993470771, 14431398369, 41707515361, 120536956513, 348358269715, 1006774084809, 2909631106713, 8408989965961]

cp's OEIS Frontend

A138574 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=3, a(3)=9, a(4)=25.

Table of values

List of values

cp's OEIS Frontend

A138574 a(n) = 2*a(n-1) + 2*a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=3, a(3)=9, a(4)=25.

Table of values

List of values

A138574 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=3, a(3)=9, a(4)=25.