A049940 - cp's OEIS frontend

A049940 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 3, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1) with a(1) = a(2) = 1.

n	a(n)
1	1
2	1
3	3
4	6
5	14
6	26
7	54
8	119
9	278
10	503
11	1008
12	2027
13	4094
14	8412
15	17554
16	38194
17	89848
18	162143
19	324288
20	648587
21	1297214
22	2594652
23	5190034
24	10383154
25	20779768
26	41631830
27	83498100
28	167969126
29	339831072
30	695251878
31	1453222088
32	3162777148
33	7438945312
34	13424668537
35	26849337076
36	53698674163

[1, 1, 3, 6, 14, 26, 54, 119, 278, 503, 1008, 2027, 4094, 8412, 17554, 38194, 89848, 162143, 324288, 648587, 1297214, 2594652, 5190034, 10383154, 20779768, 41631830, 83498100, 167969126, 339831072, 695251878, 1453222088, 3162777148, 7438945312, 13424668537, 26849337076, 53698674163]

cp's OEIS Frontend

A049940 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 3, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1) with a(1) = a(2) = 1.

Table of values

List of values