A387556 - cp's OEIS frontend

A387556 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(2k+2,2n-6*k+1).

n	a(n)
0	1
1	0
2	0
3	4
4	8
5	0
6	12
7	80
8	48
9	32
10	448
11	896
12	336
13	1920
14	8064
15	7872
16	8320
17	50688
18	101824
19	79616
20	262400
21	879616
22	1096704
23	1490944
24	5888256
25	11923456
26	13332480
27	34886656
28	100288512
29	146227200
30	228961280
31	702910464
32	1430450176
33	1968660480
34	4587044864

[1, 0, 0, 4, 8, 0, 12, 80, 48, 32, 448, 896, 336, 1920, 8064, 7872, 8320, 50688, 101824, 79616, 262400, 879616, 1096704, 1490944, 5888256, 11923456, 13332480, 34886656, 100288512, 146227200, 228961280, 702910464, 1430450176, 1968660480, 4587044864]

cp's OEIS Frontend

A387556 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(2k+2,2n-6*k+1).

Table of values

List of values

cp's OEIS Frontend

A387556 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-2*k) * binomial(2*k+2,2*n-6*k+1).

Table of values

List of values

A387556 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(2k+2,2n-6*k+1).