A018218 - cp's OEIS frontend

A018218 Sum(C(j)(n-j)4^(n-j-1),j=0..n-1), C = Catalan numbers.

n	a(n)
0	0
1	1
2	9
3	58
4	325
5	1686
6	8330
7	39796
8	185517
9	848830
10	3827230
11	17053356
12	75249954
13	329353948
14	1431575220
15	6185613032
16	26589395581
17	113780713806
18	484945025942
19	2059546425340
20	8719018250838
21	36805967321684

[0, 1, 9, 58, 325, 1686, 8330, 39796, 185517, 848830, 3827230, 17053356, 75249954, 329353948, 1431575220, 6185613032, 26589395581, 113780713806, 484945025942, 2059546425340, 8719018250838, 36805967321684]

cp's OEIS Frontend

A018218 Sum(C(j)(n-j)4^(n-j-1),j=0..n-1), C = Catalan numbers.

Table of values

List of values

cp's OEIS Frontend

A018218 Sum(C(j)*(n-j)*4^(n-j-1),j=0..n-1), C = Catalan numbers.

Table of values

List of values

A018218 Sum(C(j)(n-j)4^(n-j-1),j=0..n-1), C = Catalan numbers.