A109438 - cp's OEIS frontend

A109438 a(n) = 5a(n-1) - 5a(n-2) + a(n-3) + 2*(-1)^(n+1), alternatively a(n) = 3a(n-1) + 3a(n-2) - a(n-3).

n	a(n)
0	1
1	5
2	18
3	68
4	253
5	945
6	3526
7	13160
8	49113
9	183293
10	684058
11	2552940
12	9527701
13	35557865
14	132703758
15	495257168
16	1848324913
17	6898042485
18	25743845026
19	96077337620
20	358565505453
21	1338184684193
22	4994173231318
23	18638508241080

[1, 5, 18, 68, 253, 945, 3526, 13160, 49113, 183293, 684058, 2552940, 9527701, 35557865, 132703758, 495257168, 1848324913, 6898042485, 25743845026, 96077337620, 358565505453, 1338184684193, 4994173231318, 18638508241080]

cp's OEIS Frontend

A109438 a(n) = 5a(n-1) - 5a(n-2) + a(n-3) + 2*(-1)^(n+1), alternatively a(n) = 3a(n-1) + 3a(n-2) - a(n-3).

Table of values

List of values