A049913 - cp's OEIS frontend

A049913 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 4.

n	a(n)
1	1
2	2
3	4
4	5
5	11
6	18
7	37
8	76
9	153
10	231
11	501
12	1021
13	2049
14	4104
15	8209
16	16420
17	32841
18	49263
19	106737
20	217579
21	437213
22	875454
23	1751428
24	3503126
25	7006330
26	14012737
27	28025513
28	56051045
29	112102097
30	224204200
31	448408401
32	896816804
33	1793633609

[1, 2, 4, 5, 11, 18, 37, 76, 153, 231, 501, 1021, 2049, 4104, 8209, 16420, 32841, 49263, 106737, 217579, 437213, 875454, 1751428, 3503126, 7006330, 14012737, 28025513, 56051045, 112102097, 224204200, 448408401, 896816804, 1793633609]

cp's OEIS Frontend

A049913 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 4.

Table of values

List of values