A387627 - cp's OEIS frontend

A387627 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k+1).

n	a(n)
0	1
1	3
2	7
3	27
4	83
5	263
6	855
7	2723
8	8731
9	27999
10	89663
11	287355
12	920771
13	2950263
14	9453607
15	30291667
16	97062123
17	311012623
18	996563855
19	3193247403
20	10231988371
21	32785923879
22	105054547063
23	336621829635
24	1078623042491
25	3456186066623
26	11074510391007
27	35485583833307

[1, 3, 7, 27, 83, 263, 855, 2723, 8731, 27999, 89663, 287355, 920771, 2950263, 9453607, 30291667, 97062123, 311012623, 996563855, 3193247403, 10231988371, 32785923879, 105054547063, 336621829635, 1078623042491, 3456186066623, 11074510391007, 35485583833307]

cp's OEIS Frontend

A387627 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k+1).

Table of values

List of values

cp's OEIS Frontend

A387627 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2*n-2*k+1,2*k+1).

Table of values

List of values

A387627 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k+1).