A005230 - cp's OEIS frontend

A005230 Stern's sequence: a(1) = 1, a(n+1) is the sum of the m preceding terms, where m(m-1)/2 < n <= m(m+1)/2 or equivalently m = ceiling((sqrt(8*n+1)-1)/2) = A002024(n).

n	a(n)
1	1
2	1
3	2
4	3
5	6
6	11
7	20
8	40
9	77
10	148
11	285
12	570
13	1120
14	2200
15	4323
16	8498
17	16996
18	33707
19	66844
20	132568
21	262936
22	521549
23	1043098
24	2077698
25	4138400
26	8243093
27	16419342
28	32706116
29	65149296
30	130298592
31	260075635
32	519108172
33	1036138646
34	2068138892
35	4128034691

[1, 1, 2, 3, 6, 11, 20, 40, 77, 148, 285, 570, 1120, 2200, 4323, 8498, 16996, 33707, 66844, 132568, 262936, 521549, 1043098, 2077698, 4138400, 8243093, 16419342, 32706116, 65149296, 130298592, 260075635, 519108172, 1036138646, 2068138892, 4128034691]

cp's OEIS Frontend

A005230 Stern's sequence: a(1) = 1, a(n+1) is the sum of the m preceding terms, where m(m-1)/2 < n <= m(m+1)/2 or equivalently m = ceiling((sqrt(8*n+1)-1)/2) = A002024(n).

Table of values

List of values

cp's OEIS Frontend

A005230 Stern's sequence: a(1) = 1, a(n+1) is the sum of the m preceding terms, where m*(m-1)/2 < n <= m*(m+1)/2 or equivalently m = ceiling((sqrt(8*n+1)-1)/2) = A002024(n).

Table of values

List of values

A005230 Stern's sequence: a(1) = 1, a(n+1) is the sum of the m preceding terms, where m(m-1)/2 < n <= m(m+1)/2 or equivalently m = ceiling((sqrt(8*n+1)-1)/2) = A002024(n).