A049973 - cp's OEIS frontend

A049973 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 and a(2) = a(3) = 3.

n	a(n)
1	1
2	3
3	3
4	10
5	18
6	45
7	83
8	166
9	330
10	825
11	1567
12	3096
13	6165
14	12322
15	24637
16	49274
17	98546
18	246365
19	468093
20	923871
21	1841585
22	3680101
23	7358673
24	14716604
25	29432713
26	58865262
27	117730441
28	235460844
29	470921661
30	941843314
31	1883686621

[1, 3, 3, 10, 18, 45, 83, 166, 330, 825, 1567, 3096, 6165, 12322, 24637, 49274, 98546, 246365, 468093, 923871, 1841585, 3680101, 7358673, 14716604, 29432713, 58865262, 117730441, 235460844, 470921661, 941843314, 1883686621]

cp's OEIS Frontend

A049973 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 and a(2) = a(3) = 3.

Table of values

List of values