A049978 - cp's OEIS frontend

A049978 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n-1 <= 2^(p+1), with a(1) = 1, a(2) = 3, and a(3) = 4.

n	a(n)
1	1
2	3
3	4
4	9
5	20
6	38
7	78
8	157
9	319
10	630
11	1262
12	2525
13	5055
14	10121
15	20260
16	40560
17	81199
18	162242
19	324486
20	648973
21	1297951
22	2595913
23	5191844
24	10383728
25	20767535
26	41535232
27	83070775
28	166142182
29	332285627
30	664573784
31	1329152634
32	2658315407
33	5316651114
34	10633261669
35	21266523340
36	42533046681
37	85066093367
38	170132186745

[1, 3, 4, 9, 20, 38, 78, 157, 319, 630, 1262, 2525, 5055, 10121, 20260, 40560, 81199, 162242, 324486, 648973, 1297951, 2595913, 5191844, 10383728, 20767535, 41535232, 83070775, 166142182, 332285627, 664573784, 1329152634, 2658315407, 5316651114, 10633261669, 21266523340, 42533046681, 85066093367, 170132186745]

cp's OEIS Frontend

A049978 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n-1 <= 2^(p+1), with a(1) = 1, a(2) = 3, and a(3) = 4.

Table of values

List of values