A099785 - cp's OEIS frontend

A099785 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^(n-3*k).

n	a(n)
0	1
1	2
2	4
3	8
4	18
5	48
6	144
7	448
8	1380
9	4152
10	12224
11	35456
12	102024
13	292768
14	840416
15	2416384
16	6959504
17	20069280
18	57913536
19	167158656
20	482462752
21	1392319488
22	4017460224
23	11590946816
24	33439639616
25	96470796672
26	278311599616

[1, 2, 4, 8, 18, 48, 144, 448, 1380, 4152, 12224, 35456, 102024, 292768, 840416, 2416384, 6959504, 20069280, 57913536, 167158656, 482462752, 1392319488, 4017460224, 11590946816, 33439639616, 96470796672, 278311599616]

cp's OEIS Frontend

A099785 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^(n-3*k).

Table of values

List of values

cp's OEIS Frontend

A099785 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3*k) * 2^(n-3*k).

Table of values

List of values

A099785 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^(n-3*k).