A371842 - cp's OEIS frontend

A371842 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-2k+1,n-3*k).

n	a(n)
0	1
1	3
2	10
3	36
4	133
5	498
6	1882
7	7161
8	27391
9	105210
10	405499
11	1567332
12	6072724
13	23578221
14	91712089
15	357301827
16	1393986898
17	5445422340
18	21296030401
19	83370591273
20	326688422203
21	1281227165640
22	5028742763407
23	19751799462378
24	77632592859316
25	305316702610581

[1, 3, 10, 36, 133, 498, 1882, 7161, 27391, 105210, 405499, 1567332, 6072724, 23578221, 91712089, 357301827, 1393986898, 5445422340, 21296030401, 83370591273, 326688422203, 1281227165640, 5028742763407, 19751799462378, 77632592859316, 305316702610581]

cp's OEIS Frontend

A371842 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-2k+1,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A371842 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-2*k+1,n-3*k).

Table of values

List of values

A371842 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-2k+1,n-3*k).