A277871 - cp's OEIS frontend

A277871 a(n) = Sum_{i=0..n+1} binomial(2n-i,n-i+1)Catalan(i).

n	a(n)
0	1
1	4
2	16
3	66
4	279
5	1203
6	5275
7	23474
8	105853
9	483108
10	2229253
11	10390691
12	48879588
13	231879456
14	1108473015
15	5335987930
16	25849521109
17	125945214309
18	616833862018
19	3035286848660
20	14999774773110
21	74413424196360
22	370463714276625
23	1850251796668899

[1, 4, 16, 66, 279, 1203, 5275, 23474, 105853, 483108, 2229253, 10390691, 48879588, 231879456, 1108473015, 5335987930, 25849521109, 125945214309, 616833862018, 3035286848660, 14999774773110, 74413424196360, 370463714276625, 1850251796668899]

cp's OEIS Frontend

A277871 a(n) = Sum_{i=0..n+1} binomial(2n-i,n-i+1)Catalan(i).

Table of values

List of values

cp's OEIS Frontend

A277871 a(n) = Sum_{i=0..n+1} binomial(2*n-i,n-i+1)*Catalan(i).

Table of values

List of values

A277871 a(n) = Sum_{i=0..n+1} binomial(2n-i,n-i+1)Catalan(i).