A138573 - cp's OEIS frontend

A138573 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=2, a(3)=5.

n	a(n)
0	0
1	1
2	2
3	5
4	16
5	45
6	130
7	377
8	1088
9	3145
10	9090
11	26269
12	75920
13	219413
14	634114
15	1832625
16	5296384
17	15306833
18	44237570
19	127848949
20	369490320
21	1067846845
22	3086134658
23	8919094697
24	25776662080
25	74495936025
26	215297250946
27	622220603405

[0, 1, 2, 5, 16, 45, 130, 377, 1088, 3145, 9090, 26269, 75920, 219413, 634114, 1832625, 5296384, 15306833, 44237570, 127848949, 369490320, 1067846845, 3086134658, 8919094697, 25776662080, 74495936025, 215297250946, 622220603405]

cp's OEIS Frontend

A138573 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=2, a(3)=5.

Table of values

List of values

cp's OEIS Frontend

A138573 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)=2, a(3)=5.

Table of values

List of values

A138573 a(n) = 2a(n-1) + 2a(n-2) + 2*a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=2, a(3)=5.