A049963 - cp's OEIS frontend

A049963 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n-1 <= 2^(p+1), with a(1) = 1, a(2) = 2 and a(3) = 4.

n	a(n)
1	1
2	2
3	4
4	9
5	25
6	43
7	93
8	220
9	617
10	1016
11	2039
12	4112
13	8401
14	17598
15	38292
16	90070
17	252612
18	415156
19	830319
20	1660672
21	3321521
22	6643838
23	13290772
24	26595030
25	53262532
26	106850150
27	214945816
28	434874798
29	889700788
30	1859656696

[1, 2, 4, 9, 25, 43, 93, 220, 617, 1016, 2039, 4112, 8401, 17598, 38292, 90070, 252612, 415156, 830319, 1660672, 3321521, 6643838, 13290772, 26595030, 53262532, 106850150, 214945816, 434874798, 889700788, 1859656696]

cp's OEIS Frontend

A049963 a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n-1 <= 2^(p+1), with a(1) = 1, a(2) = 2 and a(3) = 4.

Table of values

List of values