A387647 - cp's OEIS frontend

A387647 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k,2n-4*k).

n	a(n)
0	1
1	0
2	1
3	2
4	1
5	12
6	5
7	30
8	61
9	64
10	281
11	314
12	857
13	1812
14	2701
15	7606
16	11925
17	26376
18	55393
19	96402
20	223985
21	405276
22	835989
23	1726158
24	3233133
25	6901328
26	13260073
27	26731882
28	54453001
29	105630628
30	217246237
31	427776358
32	856449221
33	1729791512
34	3411468145
35	6904065986

[1, 0, 1, 2, 1, 12, 5, 30, 61, 64, 281, 314, 857, 1812, 2701, 7606, 11925, 26376, 55393, 96402, 223985, 405276, 835989, 1726158, 3233133, 6901328, 13260073, 26731882, 54453001, 105630628, 217246237, 427776358, 856449221, 1729791512, 3411468145, 6904065986]

cp's OEIS Frontend

A387647 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k,2n-4*k).

Table of values

List of values

cp's OEIS Frontend

A387647 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k,2*n-4*k).

Table of values

List of values

A387647 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k,2n-4*k).