A129804 - cp's OEIS frontend

A129804 a(0) = 1, a(1) = 2; for n>0, a(2n) = 3a(2n-1) - a(2n-2), a(2n+1) = 3a(2n) - a(2n-1) - a(n-1).

n	a(n)
0	1
1	2
2	5
3	12
4	31
5	79
6	206
7	534
8	1396
9	3642
10	9530
11	24917
12	65221
13	170667
14	446780
15	1169467
16	3061621
17	8014862
18	20982965
19	54932637
20	143814946
21	376508559
22	985710731
23	2580614104
24	6756131581
25	17687755722
26	46307135585
27	121233585812

[1, 2, 5, 12, 31, 79, 206, 534, 1396, 3642, 9530, 24917, 65221, 170667, 446780, 1169467, 3061621, 8014862, 20982965, 54932637, 143814946, 376508559, 985710731, 2580614104, 6756131581, 17687755722, 46307135585, 121233585812]

cp's OEIS Frontend

A129804 a(0) = 1, a(1) = 2; for n>0, a(2n) = 3a(2n-1) - a(2n-2), a(2n+1) = 3a(2n) - a(2n-1) - a(n-1).

Table of values

List of values

cp's OEIS Frontend

A129804 a(0) = 1, a(1) = 2; for n>0, a(2*n) = 3*a(2*n-1) - a(2*n-2), a(2*n+1) = 3*a(2*n) - a(2*n-1) - a(n-1).

Table of values

List of values

A129804 a(0) = 1, a(1) = 2; for n>0, a(2n) = 3a(2n-1) - a(2n-2), a(2n+1) = 3a(2n) - a(2n-1) - a(n-1).