A368794 - cp's OEIS frontend

A368794 a(n) = (2n-1)!! Sum_{k=1..n} (-1)^(k-1)/(2*k-1)!!.

n	a(n)
0	0
1	1
2	2
3	11
4	76
5	685
6	7534
7	97943
8	1469144
9	24975449
10	474533530
11	9965204131
12	229199695012
13	5729992375301
14	154709794133126
15	4486584029860655
16	139084104925680304
17	4589775462547450033
18	160642141189160751154
19	5943759223998947792699
20	231806609735958963915260

[0, 1, 2, 11, 76, 685, 7534, 97943, 1469144, 24975449, 474533530, 9965204131, 229199695012, 5729992375301, 154709794133126, 4486584029860655, 139084104925680304, 4589775462547450033, 160642141189160751154, 5943759223998947792699, 231806609735958963915260]

cp's OEIS Frontend

A368794 a(n) = (2n-1)!! Sum_{k=1..n} (-1)^(k-1)/(2*k-1)!!.

Table of values

List of values

cp's OEIS Frontend

A368794 a(n) = (2*n-1)!! * Sum_{k=1..n} (-1)^(k-1)/(2*k-1)!!.

Table of values

List of values

A368794 a(n) = (2n-1)!! Sum_{k=1..n} (-1)^(k-1)/(2*k-1)!!.