A099782 - cp's OEIS frontend

A099782 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * 4^(n-3*k).

n	a(n)
0	1
1	4
2	16
3	66
4	280
5	1216
6	5380
7	24144
8	109504
9	500488
10	2300128
11	10612224
12	49096720
13	227578432
14	1056304384
15	4907373600
16	22813275520
17	106100835328
18	493609021504
19	2296885357824
20	10689540189184
21	49753373831296
22	231588118339072

[1, 4, 16, 66, 280, 1216, 5380, 24144, 109504, 500488, 2300128, 10612224, 49096720, 227578432, 1056304384, 4907373600, 22813275520, 106100835328, 493609021504, 2296885357824, 10689540189184, 49753373831296, 231588118339072]

cp's OEIS Frontend

A099782 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * 4^(n-3*k).

Table of values

List of values

cp's OEIS Frontend

A099782 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2*k) * 2^k * 4^(n-3*k).

Table of values

List of values

A099782 a(n) = Sum_{k=0..floor(n/3)} C(n-k,2k) 2^k * 4^(n-3*k).