A387624 - cp's OEIS frontend

A387624 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k).

n	a(n)
0	1
1	1
2	7
3	21
4	63
5	213
6	671
7	2149
8	6911
9	22101
10	70847
11	227045
12	727391
13	2330901
14	7468767
15	23931621
16	76683583
17	245713493
18	787329151
19	2522806629
20	8083720351
21	25902323221
22	82997717407
23	265946059365
24	852159682431
25	2730539119701
26	8749350654527
27	28035173160421

[1, 1, 7, 21, 63, 213, 671, 2149, 6911, 22101, 70847, 227045, 727391, 2330901, 7468767, 23931621, 76683583, 245713493, 787329151, 2522806629, 8083720351, 25902323221, 82997717407, 265946059365, 852159682431, 2730539119701, 8749350654527, 28035173160421]

cp's OEIS Frontend

A387624 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k).

Table of values

List of values

cp's OEIS Frontend

A387624 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2*n-2*k+1,2*k).

Table of values

List of values

A387624 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2n-2k+1,2*k).