A001045 - cp's OEIS frontend

A001045 Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.

n	a(n)
0	0
1	1
2	1
3	3
4	5
5	11
6	21
7	43
8	85
9	171
10	341
11	683
12	1365
13	2731
14	5461
15	10923
16	21845
17	43691
18	87381
19	174763
20	349525
21	699051
22	1398101
23	2796203
24	5592405
25	11184811
26	22369621
27	44739243
28	89478485
29	178956971
30	357913941
31	715827883
32	1431655765
33	2863311531
34	5726623061
35	11453246123

[0, 1, 1, 3, 5, 11, 21, 43, 85, 171, 341, 683, 1365, 2731, 5461, 10923, 21845, 43691, 87381, 174763, 349525, 699051, 1398101, 2796203, 5592405, 11184811, 22369621, 44739243, 89478485, 178956971, 357913941, 715827883, 1431655765, 2863311531, 5726623061, 11453246123]

cp's OEIS Frontend

A001045 Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.

Table of values

List of values