A049957 - cp's OEIS frontend

A049957 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) = 3.

n	a(n)
1	1
2	2
3	3
4	8
5	15
6	37
7	69
8	137
9	273
10	682
11	1296
12	2560
13	5098
14	10189
15	20373
16	40745
17	81489
18	203722
19	387072
20	763960
21	1522829
22	3043120
23	6084976
24	12169338
25	24338267
26	48676398
27	97352728
28	194705424
29	389410826
30	778821645
31	1557643285
32	3115286569
33	6230573137
34	15576432842
35	29595222400

[1, 2, 3, 8, 15, 37, 69, 137, 273, 682, 1296, 2560, 5098, 10189, 20373, 40745, 81489, 203722, 387072, 763960, 1522829, 3043120, 6084976, 12169338, 24338267, 48676398, 97352728, 194705424, 389410826, 778821645, 1557643285, 3115286569, 6230573137, 15576432842, 29595222400]

cp's OEIS Frontend

A049957 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) = 3.

Table of values

List of values