A109437 - cp's OEIS frontend

A109437 a(-1) = a(0) = 0, a(1) = 1; 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	0
1	1
2	3
3	12
4	44
5	165
6	615
7	2296
8	8568
9	31977
10	119339
11	445380
12	1662180
13	6203341
14	23151183
15	86401392
16	322454384
17	1203416145
18	4491210195
19	16761424636
20	62554488348
21	233456528757
22	871271626679
23	3251629977960
24	12135248285160
25	45289363162681
26	169022204365563
27	630799454299572

[0, 1, 3, 12, 44, 165, 615, 2296, 8568, 31977, 119339, 445380, 1662180, 6203341, 23151183, 86401392, 322454384, 1203416145, 4491210195, 16761424636, 62554488348, 233456528757, 871271626679, 3251629977960, 12135248285160, 45289363162681, 169022204365563, 630799454299572]

cp's OEIS Frontend

A109437 a(-1) = a(0) = 0, a(1) = 1; 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