A334066 - cp's OEIS frontend

A334066 a(n) = (2n-1)!!(Sum_{k=1..n}k/(2k-1)).

n	a(n)
1	1
2	5
3	34
4	298
5	3207
6	40947
7	605076
8	10157220
9	190915965
10	3971997585
11	90613969110
12	2249113016430
13	60338869272675
14	1739831420490975
15	53656981894391400
16	1762410972384203400
17	61421841416041392825
18	2263752327235180060125
19	87970054921758957890250

[1, 5, 34, 298, 3207, 40947, 605076, 10157220, 190915965, 3971997585, 90613969110, 2249113016430, 60338869272675, 1739831420490975, 53656981894391400, 1762410972384203400, 61421841416041392825, 2263752327235180060125, 87970054921758957890250]

cp's OEIS Frontend

A334066 a(n) = (2n-1)!!(Sum_{k=1..n}k/(2k-1)).

Table of values

List of values

cp's OEIS Frontend

A334066 a(n) = (2n-1)!!*(Sum_{k=1..n}k/(2*k-1)).

Table of values

List of values

A334066 a(n) = (2n-1)!!(Sum_{k=1..n}k/(2k-1)).