A117403 - cp's OEIS frontend

A117403 a(n) = Sum_{k=0..floor(n/2)} 2^((n-2k)k) for n>=0.

n	a(n)
0	1
1	1
2	2
3	3
4	6
5	13
6	34
7	105
8	386
9	1681
10	8706
11	53793
12	395266
13	3442753
14	35659778
15	440672385
16	6476038146
17	112812130561
18	2336999211010
19	57759810847233
20	1697654543745026
21	59146046307566593
22	2450521284684021762

[1, 1, 2, 3, 6, 13, 34, 105, 386, 1681, 8706, 53793, 395266, 3442753, 35659778, 440672385, 6476038146, 112812130561, 2336999211010, 57759810847233, 1697654543745026, 59146046307566593, 2450521284684021762]

cp's OEIS Frontend

A117403 a(n) = Sum_{k=0..floor(n/2)} 2^((n-2k)k) for n>=0.

Table of values

List of values

cp's OEIS Frontend

A117403 a(n) = Sum_{k=0..floor(n/2)} 2^((n-2*k)*k) for n>=0.

Table of values

List of values

A117403 a(n) = Sum_{k=0..floor(n/2)} 2^((n-2k)k) for n>=0.