A319172 - cp's OEIS frontend

A319172 a(n) = 2*(a(n-1) + a(n-3)) - a(n-4), with a(0) = 1, a(1) = 2, a(2) = 5 and a(3) = 12.

n	a(n)
0	1
1	2
2	5
3	12
4	27
5	62
6	143
7	328
8	753
9	1730
10	3973
11	9124
12	20955
13	48126
14	110527
15	253840
16	582977
17	1338882
18	3074917
19	7061948
20	16218683
21	37248318
22	85545615
23	196466648
24	451211249
25	1036265410
26	2379918501
27	5465792852
28	12552905275
29	28829382142

[1, 2, 5, 12, 27, 62, 143, 328, 753, 1730, 3973, 9124, 20955, 48126, 110527, 253840, 582977, 1338882, 3074917, 7061948, 16218683, 37248318, 85545615, 196466648, 451211249, 1036265410, 2379918501, 5465792852, 12552905275, 28829382142]

cp's OEIS Frontend

A319172 a(n) = 2*(a(n-1) + a(n-3)) - a(n-4), with a(0) = 1, a(1) = 2, a(2) = 5 and a(3) = 12.

Table of values

List of values