A387510 - cp's OEIS frontend

A387510 a(n) = Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(n-2*k,k)^2.

n	a(n)
0	1
1	2
2	4
3	10
4	32
5	104
6	324
7	1000
8	3136
9	9992
10	32064
11	103168
12	332816
13	1077152
14	3497024
15	11381920
16	37121280
17	121285760
18	396922944
19	1300906112
20	4269367296
21	14028169344
22	46143475712
23	151932559360
24	500710965504
25	1651533562368
26	5451595506688
27	18008220715520

[1, 2, 4, 10, 32, 104, 324, 1000, 3136, 9992, 32064, 103168, 332816, 1077152, 3497024, 11381920, 37121280, 121285760, 396922944, 1300906112, 4269367296, 14028169344, 46143475712, 151932559360, 500710965504, 1651533562368, 5451595506688, 18008220715520]

cp's OEIS Frontend

A387510 a(n) = Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(n-2*k,k)^2.

Table of values

List of values

cp's OEIS Frontend

A387510 a(n) = Sum_{k=0..floor(n/3)} 2^(n-2*k) * binomial(n-2*k,k)^2.

Table of values

List of values

A387510 a(n) = Sum_{k=0..floor(n/3)} 2^(n-2k) binomial(n-2*k,k)^2.