A371837 - cp's OEIS frontend

A371837 a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(2n-3k-1,n-3*k).

n	a(n)
0	1
1	1
2	3
3	13
4	51
5	201
6	834
7	3529
8	15075
9	65431
10	288278
11	1285263
12	5799470
13	26492103
14	122432628
15	572291385
16	2705760291
17	12937116213
18	62542367166
19	305668511259
20	1510080076410
21	7539381024297
22	38034307340076
23	193835252945487
24	997724306958606
25	5185731234177001

[1, 1, 3, 13, 51, 201, 834, 3529, 15075, 65431, 288278, 1285263, 5799470, 26492103, 122432628, 572291385, 2705760291, 12937116213, 62542367166, 305668511259, 1510080076410, 7539381024297, 38034307340076, 193835252945487, 997724306958606, 5185731234177001]

cp's OEIS Frontend

A371837 a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(2n-3k-1,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A371837 a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(2*n-3*k-1,n-3*k).

Table of values

List of values

A371837 a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(2n-3k-1,n-3*k).