A378406 - cp's OEIS frontend

A378406 a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n+2k,n-2k).

n	a(n)
0	1
1	1
2	3
3	16
4	67
5	266
6	1116
7	4803
8	20707
9	89665
10	390868
11	1712283
12	7527664
13	33196606
14	146800811
15	650724896
16	2890442051
17	12862496583
18	57331583055
19	255915024714
20	1143845768892
21	5118643987872
22	22930389117771
23	102824420890590
24	461502269341936
25	2073064313021416

[1, 1, 3, 16, 67, 266, 1116, 4803, 20707, 89665, 390868, 1712283, 7527664, 33196606, 146800811, 650724896, 2890442051, 12862496583, 57331583055, 255915024714, 1143845768892, 5118643987872, 22930389117771, 102824420890590, 461502269341936, 2073064313021416]

cp's OEIS Frontend

A378406 a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n+2k,n-2k).

Table of values

List of values

cp's OEIS Frontend

A378406 a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n+2*k,n-2*k).

Table of values

List of values

A378406 a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n+2k,n-2k).