A386940 - cp's OEIS frontend

A386940 a(n) = Sum_{k=0..n} binomial(2k,k) binomial(2*n-k-1,n-k).

n	a(n)
0	1
1	3
2	13
3	60
4	285
5	1378
6	6748
7	33372
8	166365
9	834900
10	4213638
11	21368724
12	108820764
13	556184580
14	2851679620
15	14661848560
16	75568345821
17	390330333402
18	2020046912260
19	10472193542100
20	54373036935910
21	282704274266040
22	1471722678992700
23	7670327017789800
24	40017679829372700

[1, 3, 13, 60, 285, 1378, 6748, 33372, 166365, 834900, 4213638, 21368724, 108820764, 556184580, 2851679620, 14661848560, 75568345821, 390330333402, 2020046912260, 10472193542100, 54373036935910, 282704274266040, 1471722678992700, 7670327017789800, 40017679829372700]

cp's OEIS Frontend

A386940 a(n) = Sum_{k=0..n} binomial(2k,k) binomial(2*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A386940 a(n) = Sum_{k=0..n} binomial(2*k,k) * binomial(2*n-k-1,n-k).

Table of values

List of values

A386940 a(n) = Sum_{k=0..n} binomial(2k,k) binomial(2*n-k-1,n-k).