A128088 - cp's OEIS frontend

A128088 a(n) = Sum_{k=0..n} A000108(k)*A001263(n+1,k+1), where A000108 is the Catalan numbers and A001263 is the Narayana triangle.

n	a(n)
0	1
1	2
2	6
3	24
4	115
5	618
6	3591
7	22088
8	141903
9	943590
10	6452490
11	45159480
12	322305165
13	2339100078
14	17223121350
15	128428689888
16	968383277791
17	7374380672718
18	56655414930642
19	438741242896680
20	3422125459579869
21	26866961380274598
22	212191772351034249
23	1685036376746788392

[1, 2, 6, 24, 115, 618, 3591, 22088, 141903, 943590, 6452490, 45159480, 322305165, 2339100078, 17223121350, 128428689888, 968383277791, 7374380672718, 56655414930642, 438741242896680, 3422125459579869, 26866961380274598, 212191772351034249, 1685036376746788392]

cp's OEIS Frontend

A128088 a(n) = Sum_{k=0..n} A000108(k)*A001263(n+1,k+1), where A000108 is the Catalan numbers and A001263 is the Narayana triangle.

Table of values

List of values