A086618 - cp's OEIS frontend

A086618 a(n) = Sum{k=0..n} binomial(n,k)^2*C(k), where C() = A000108() are the Catalan numbers.

n	a(n)
0	1
1	2
2	7
3	33
4	183
5	1118
6	7281
7	49626
8	349999
9	2535078
10	18758265
11	141254655
12	1079364105
13	8350678170
14	65298467487
15	515349097713
16	4100346740511
17	32858696386766
18	265001681344569

[1, 2, 7, 33, 183, 1118, 7281, 49626, 349999, 2535078, 18758265, 141254655, 1079364105, 8350678170, 65298467487, 515349097713, 4100346740511, 32858696386766, 265001681344569]

cp's OEIS Frontend

A086618 a(n) = Sum{k=0..n} binomial(n,k)^2*C(k), where C() = A000108() are the Catalan numbers.

Table of values

List of values