A387651 - cp's OEIS frontend

A387651 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k+1).

n	a(n)
0	1
1	0
2	3
3	2
4	5
5	20
6	11
7	70
8	93
9	176
10	515
11	618
12	1877
13	3212
14	6043
15	14670
16	23469
17	55336
18	104915
19	201202
20	442213
21	801924
22	1711787
23	3369814
24	6574205
25	13748896
26	26354723
27	54064250
28	107762933
29	212616060
30	434126907
31	852642910
32	1721793229
33	3443972120
34	6839443699
35	13808517634

[1, 0, 3, 2, 5, 20, 11, 70, 93, 176, 515, 618, 1877, 3212, 6043, 14670, 23469, 55336, 104915, 201202, 442213, 801924, 1711787, 3369814, 6574205, 13748896, 26354723, 54064250, 107762933, 212616060, 434126907, 852642910, 1721793229, 3443972120, 6839443699, 13808517634]

cp's OEIS Frontend

A387651 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k+1).

Table of values

List of values

cp's OEIS Frontend

A387651 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k+1,2*n-4*k+1).

Table of values

List of values

A387651 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k+1).