A273019 - cp's OEIS frontend

A273019 a(n) = hypergeom([-2n-1, 1/2], [2], 4) + (2n+1)*hypergeom([-n+1/2, -n], [2], 4).

n	a(n)
0	1
1	5
2	39
3	321
4	2675
5	22483
6	190345
7	1621413
8	13882947
9	119385663
10	1030434069
11	8921880135
12	77459553549
13	674100041501
14	5878674505303
15	51361306358401
16	449476337521875
17	3939287035681807
18	34570459724919253
19	303749080936528883
20	2671775251987354377
21	23524418982229636185

[1, 5, 39, 321, 2675, 22483, 190345, 1621413, 13882947, 119385663, 1030434069, 8921880135, 77459553549, 674100041501, 5878674505303, 51361306358401, 449476337521875, 3939287035681807, 34570459724919253, 303749080936528883, 2671775251987354377, 23524418982229636185]

cp's OEIS Frontend

A273019 a(n) = hypergeom([-2n-1, 1/2], [2], 4) + (2n+1)*hypergeom([-n+1/2, -n], [2], 4).

Table of values

List of values

cp's OEIS Frontend

A273019 a(n) = hypergeom([-2*n-1, 1/2], [2], 4) + (2*n+1)*hypergeom([-n+1/2, -n], [2], 4).

Table of values

List of values

A273019 a(n) = hypergeom([-2n-1, 1/2], [2], 4) + (2n+1)*hypergeom([-n+1/2, -n], [2], 4).