A049905 - cp's OEIS frontend

A049905 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 3, where m = 2^(p+1) + 2 - n and p is the unique number such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = 2.

n	a(n)
1	1
2	2
3	2
4	3
5	7
6	12
7	25
8	50
9	101
10	153
11	331
12	675
13	1355
14	2714
15	5429
16	10858
17	21717
18	32577
19	70583
20	143881
21	289121
22	578922
23	1158188
24	2316554
25	4633160
26	9266371
27	18532767
28	37065547
29	74131099
30	148262202
31	296524405
32	593048810
33	1186097621

[1, 2, 2, 3, 7, 12, 25, 50, 101, 153, 331, 675, 1355, 2714, 5429, 10858, 21717, 32577, 70583, 143881, 289121, 578922, 1158188, 2316554, 4633160, 9266371, 18532767, 37065547, 74131099, 148262202, 296524405, 593048810, 1186097621]

cp's OEIS Frontend

A049905 a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 3, where m = 2^(p+1) + 2 - n and p is the unique number such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = 2.

Table of values

List of values