A084068 - cp's OEIS frontend

A084068 a(1) = 1, a(2) = 2; a(2k) = 2a(2k-1) - a(2k-2), a(2k+1) = 4a(2k) - a(2k-1).

n	a(n)
1	1
2	2
3	7
4	12
5	41
6	70
7	239
8	408
9	1393
10	2378
11	8119
12	13860
13	47321
14	80782
15	275807
16	470832
17	1607521
18	2744210
19	9369319
20	15994428
21	54608393
22	93222358
23	318281039
24	543339720
25	1855077841
26	3166815962
27	10812186007
28	18457556052
29	63018038201
30	107578520350

[1, 2, 7, 12, 41, 70, 239, 408, 1393, 2378, 8119, 13860, 47321, 80782, 275807, 470832, 1607521, 2744210, 9369319, 15994428, 54608393, 93222358, 318281039, 543339720, 1855077841, 3166815962, 10812186007, 18457556052, 63018038201, 107578520350]

cp's OEIS Frontend

A084068 a(1) = 1, a(2) = 2; a(2k) = 2a(2k-1) - a(2k-2), a(2k+1) = 4a(2k) - a(2k-1).

Table of values

List of values

cp's OEIS Frontend

A084068 a(1) = 1, a(2) = 2; a(2*k) = 2*a(2*k-1) - a(2*k-2), a(2*k+1) = 4*a(2*k) - a(2*k-1).

Table of values

List of values

A084068 a(1) = 1, a(2) = 2; a(2k) = 2a(2k-1) - a(2k-2), a(2k+1) = 4a(2k) - a(2k-1).