A375308 - cp's OEIS frontend

A375308 a(n) = Sum_{k=0..floor(2n/3)} binomial(4n-4k,2k).

n	a(n)
0	1
1	1
2	7
3	30
4	137
5	644
6	2936
7	13625
8	62701
9	289547
10	1335378
11	6161329
12	28424456
13	131135696
14	604991601
15	2791106585
16	12876698159
17	59406240678
18	274068969337
19	1264408966284
20	5833313285128
21	26911817257385
22	124156868897413
23	572794023175795
24	2642568194952474

[1, 1, 7, 30, 137, 644, 2936, 13625, 62701, 289547, 1335378, 6161329, 28424456, 131135696, 604991601, 2791106585, 12876698159, 59406240678, 274068969337, 1264408966284, 5833313285128, 26911817257385, 124156868897413, 572794023175795, 2642568194952474]

cp's OEIS Frontend

A375308 a(n) = Sum_{k=0..floor(2n/3)} binomial(4n-4k,2k).

Table of values

List of values

cp's OEIS Frontend

A375308 a(n) = Sum_{k=0..floor(2*n/3)} binomial(4*n-4*k,2*k).

Table of values

List of values

A375308 a(n) = Sum_{k=0..floor(2n/3)} binomial(4n-4k,2k).