A143388 - cp's OEIS frontend

A143388 a(n) = Sum_{k=0..n} A033184(n,k)A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2n-k,n-k)*(k+1)/(n+1).

n	a(n)
0	1
1	2
2	8
3	40
4	221
5	1288
6	7752
7	47652
8	297275
9	1874730
10	11920740
11	76292736
12	490828828
13	3171317360
14	20563942288
15	133749903324
16	872196460359
17	5700580759510
18	37332393806400
19	244914161562840
20	1609234420792845
21	10588423438256160
22	69757296470927520
23	460089876775105200

[1, 2, 8, 40, 221, 1288, 7752, 47652, 297275, 1874730, 11920740, 76292736, 490828828, 3171317360, 20563942288, 133749903324, 872196460359, 5700580759510, 37332393806400, 244914161562840, 1609234420792845, 10588423438256160, 69757296470927520, 460089876775105200]

cp's OEIS Frontend

A143388 a(n) = Sum_{k=0..n} A033184(n,k)A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2n-k,n-k)*(k+1)/(n+1).

Table of values

List of values

cp's OEIS Frontend

A143388 a(n) = Sum_{k=0..n} A033184(n,k)*A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2*n-k,n-k)*(k+1)/(n+1).

Table of values

List of values

A143388 a(n) = Sum_{k=0..n} A033184(n,k)A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2n-k,n-k)*(k+1)/(n+1).