A387515 - cp's OEIS frontend

A387515 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(k,n-2*k)^2.

n	a(n)
0	1
1	0
2	1
3	2
4	1
5	8
6	5
7	18
8	37
9	40
10	145
11	178
12	417
13	872
14	1301
15	3330
16	5365
17	11080
18	22801
19	39362
20	86721
21	157128
22	312293
23	631666
24	1169541
25	2416104
26	4602961
27	9061458
28	18123553
29	34717608
30	69825013
31	135902818
32	267384405
33	531611656
34	1035512785
35	2060791650
36	4048647489
37	7979180296

[1, 0, 1, 2, 1, 8, 5, 18, 37, 40, 145, 178, 417, 872, 1301, 3330, 5365, 11080, 22801, 39362, 86721, 157128, 312293, 631666, 1169541, 2416104, 4602961, 9061458, 18123553, 34717608, 69825013, 135902818, 267384405, 531611656, 1035512785, 2060791650, 4048647489, 7979180296]

cp's OEIS Frontend

A387515 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(k,n-2*k)^2.

Table of values

List of values

cp's OEIS Frontend

A387515 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(k,n-2*k)^2.

Table of values

List of values

A387515 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(k,n-2*k)^2.