A099784 - cp's OEIS frontend

A099784 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * (-2)^(n-3*k).

n	a(n)
0	1
1	-2
2	4
3	-6
4	4
5	16
6	-92
7	312
8	-848
9	1960
10	-3824
11	5760
12	-3824
13	-15392
14	88384
15	-299616
16	814144
17	-1881344
18	3669568
19	-5524608
20	3657472
21	14807680
22	-84909824
23	287723520
24	-781639424
25	1805843968
26	-3521371136
27	5298829824

[1, -2, 4, -6, 4, 16, -92, 312, -848, 1960, -3824, 5760, -3824, -15392, 88384, -299616, 814144, -1881344, 3669568, -5524608, 3657472, 14807680, -84909824, 287723520, -781639424, 1805843968, -3521371136, 5298829824]

cp's OEIS Frontend

A099784 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * (-2)^(n-3*k).

Table of values

List of values

cp's OEIS Frontend

A099784 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2*k) * 2^k * (-2)^(n-3*k).

Table of values

List of values

A099784 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * (-2)^(n-3*k).