A361753 - cp's OEIS frontend

A361753 a(n) = Sum_{k=0..floor(n/3)} binomial(2(n-3k),k) * binomial(2(n-3k),n-3*k).

n	a(n)
0	1
1	2
2	6
3	20
4	74
5	276
6	1044
7	3994
8	15426
9	60008
10	234764
11	922716
12	3640700
13	14411952
14	57210750
15	227659704
16	907853778
17	3627085932
18	14515139376
19	58174092472
20	233463067284
21	938061587212
22	3773298437204
23	15193083455580
24	61230698571372
25	246978403761112

[1, 2, 6, 20, 74, 276, 1044, 3994, 15426, 60008, 234764, 922716, 3640700, 14411952, 57210750, 227659704, 907853778, 3627085932, 14515139376, 58174092472, 233463067284, 938061587212, 3773298437204, 15193083455580, 61230698571372, 246978403761112]

cp's OEIS Frontend

A361753 a(n) = Sum_{k=0..floor(n/3)} binomial(2(n-3k),k) * binomial(2(n-3k),n-3*k).

Table of values

List of values

cp's OEIS Frontend

A361753 a(n) = Sum_{k=0..floor(n/3)} binomial(2*(n-3*k),k) * binomial(2*(n-3*k),n-3*k).

Table of values

List of values

A361753 a(n) = Sum_{k=0..floor(n/3)} binomial(2(n-3k),k) * binomial(2(n-3k),n-3*k).