A259554 - cp's OEIS frontend

A259554 a(n) = Sum_{i=0..n} (2^(i)(-1)^(i+n)C(n,i)C(2n+i-1,n-1)).

n	a(n)
1	1
2	7
3	52
4	403
5	3206
6	25954
7	212738
8	1760035
9	14666470
10	122920642
11	1035046816
12	8749594462
13	74207078908
14	631140253072
15	5381022869822
16	45975731083555
17	393556869530630
18	3374504760608026
19	28977403637496104
20	249167023897718138

[1, 7, 52, 403, 3206, 25954, 212738, 1760035, 14666470, 122920642, 1035046816, 8749594462, 74207078908, 631140253072, 5381022869822, 45975731083555, 393556869530630, 3374504760608026, 28977403637496104, 249167023897718138]

cp's OEIS Frontend

A259554 a(n) = Sum_{i=0..n} (2^(i)(-1)^(i+n)C(n,i)C(2n+i-1,n-1)).

Table of values

List of values

cp's OEIS Frontend

A259554 a(n) = Sum_{i=0..n} (2^(i)*(-1)^(i+n)*C(n,i)*C(2*n+i-1,n-1)).

Table of values

List of values

A259554 a(n) = Sum_{i=0..n} (2^(i)(-1)^(i+n)C(n,i)C(2n+i-1,n-1)).