A387508 - cp's OEIS frontend

A387508 a(n) = Sum_{k=0..floor(n/4)} 2^k * binomial(n-3*k,k)^2.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	9
6	19
7	33
8	55
9	109
10	243
11	529
12	1071
13	2093
14	4179
15	8673
16	18255
17	37981
18	77923
19	159649
20	329935
21	687117
22	1432403
23	2977505
24	6179215
25	12841597
26	26757059
27	55840033
28	116551119
29	243209325
30	507658803
31	1060551137
32	2217515151
33	4639042909
34	9707403811

[1, 1, 1, 1, 3, 9, 19, 33, 55, 109, 243, 529, 1071, 2093, 4179, 8673, 18255, 37981, 77923, 159649, 329935, 687117, 1432403, 2977505, 6179215, 12841597, 26757059, 55840033, 116551119, 243209325, 507658803, 1060551137, 2217515151, 4639042909, 9707403811]

cp's OEIS Frontend

A387508 a(n) = Sum_{k=0..floor(n/4)} 2^k * binomial(n-3*k,k)^2.

Table of values

List of values