A360291 - cp's OEIS frontend

A360291 a(n) = Sum_{k=0..floor(n/3)} binomial(n-1-2k,k) binomial(2n-6k,n-3*k).

n	a(n)
0	1
1	2
2	6
3	20
4	72
5	264
6	984
7	3714
8	14148
9	54284
10	209482
11	812196
12	3161340
13	12345658
14	48348522
15	189807336
16	746740510
17	2943359208
18	11620961412
19	45950375602
20	181936110006
21	721233025332
22	2862271873966
23	11370584735100
24	45212101270728
25	179926167512914

[1, 2, 6, 20, 72, 264, 984, 3714, 14148, 54284, 209482, 812196, 3161340, 12345658, 48348522, 189807336, 746740510, 2943359208, 11620961412, 45950375602, 181936110006, 721233025332, 2862271873966, 11370584735100, 45212101270728, 179926167512914]

cp's OEIS Frontend

A360291 a(n) = Sum_{k=0..floor(n/3)} binomial(n-1-2k,k) binomial(2n-6k,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A360291 a(n) = Sum_{k=0..floor(n/3)} binomial(n-1-2*k,k) * binomial(2*n-6*k,n-3*k).

Table of values

List of values

A360291 a(n) = Sum_{k=0..floor(n/3)} binomial(n-1-2k,k) binomial(2n-6k,n-3*k).