A387557 - cp's OEIS frontend

A387557 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+2,2n-6*k+1).

n	a(n)
0	1
1	0
2	0
3	2
4	4
5	0
6	3
7	20
8	12
9	4
10	56
11	112
12	37
13	120
14	504
15	486
16	300
17	1584
18	3175
19	2124
20	4196
21	13736
22	16576
23	14560
24	46217
25	92336
26	87024
27	145226
28	391124
29	540192
30	584267
31	1397444
32	2742332
33	3162828
34	4973640
35	11517840
36	17306989
37	21377448
38	43440616
39	82902062
40	108691196

[1, 0, 0, 2, 4, 0, 3, 20, 12, 4, 56, 112, 37, 120, 504, 486, 300, 1584, 3175, 2124, 4196, 13736, 16576, 14560, 46217, 92336, 87024, 145226, 391124, 540192, 584267, 1397444, 2742332, 3162828, 4973640, 11517840, 17306989, 21377448, 43440616, 82902062, 108691196]

cp's OEIS Frontend

A387557 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+2,2n-6*k+1).

Table of values

List of values

cp's OEIS Frontend

A387557 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+2,2*n-6*k+1).

Table of values

List of values

A387557 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+2,2n-6*k+1).