A243945 - cp's OEIS frontend

A243945 a(n) = Sum_{k=0..n} C(2k, k)^2 C(n+k, n-k).

n	a(n)
0	1
1	5
2	49
3	605
4	8281
5	120125
6	1809025
7	27966125
8	440790025
9	7051890125
10	114160867129
11	1865975723045
12	30743797894681
13	509948702030045
14	8507207970913729
15	142626515754330125
16	2401552098016698025
17	40591712338241826125
18	688413807606268692025
19	11710401759994742685125

[1, 5, 49, 605, 8281, 120125, 1809025, 27966125, 440790025, 7051890125, 114160867129, 1865975723045, 30743797894681, 509948702030045, 8507207970913729, 142626515754330125, 2401552098016698025, 40591712338241826125, 688413807606268692025, 11710401759994742685125]

cp's OEIS Frontend

A243945 a(n) = Sum_{k=0..n} C(2k, k)^2 C(n+k, n-k).

Table of values

List of values

cp's OEIS Frontend

A243945 a(n) = Sum_{k=0..n} C(2*k, k)^2 * C(n+k, n-k).

Table of values

List of values

A243945 a(n) = Sum_{k=0..n} C(2k, k)^2 C(n+k, n-k).