A387513 - cp's OEIS frontend

A387513 a(n) = Sum_{k=0..floor(n/3)} 3^(n-2k) binomial(n-2*k,k)^2.

n	a(n)
0	1
1	3
2	9
3	30
4	117
5	486
6	2034
7	8505
8	35721
9	151173
10	644274
11	2760237
12	11871846
13	51223428
14	221624019
15	961221735
16	4177946385
17	18193784220
18	79361528679
19	346693615128
20	1516579388406
21	6642203294691
22	29123170761807
23	127821123780795
24	561522735794574
25	2468882933230887

[1, 3, 9, 30, 117, 486, 2034, 8505, 35721, 151173, 644274, 2760237, 11871846, 51223428, 221624019, 961221735, 4177946385, 18193784220, 79361528679, 346693615128, 1516579388406, 6642203294691, 29123170761807, 127821123780795, 561522735794574, 2468882933230887]

cp's OEIS Frontend

A387513 a(n) = Sum_{k=0..floor(n/3)} 3^(n-2k) binomial(n-2*k,k)^2.

Table of values

List of values

cp's OEIS Frontend

A387513 a(n) = Sum_{k=0..floor(n/3)} 3^(n-2*k) * binomial(n-2*k,k)^2.

Table of values

List of values

A387513 a(n) = Sum_{k=0..floor(n/3)} 3^(n-2k) binomial(n-2*k,k)^2.