A335090 - cp's OEIS frontend

A335090 a(n) = ((2n+1)!!)^2 (Sum_{k=1..n} 1/(2*k+1)^2).

n	a(n)
0	0
1	1
2	34
3	1891
4	164196
5	20760741
6	3616621254
7	832001250375
8	244557191709000
9	89472598178279625
10	39886085958271670250
11	21288783013213520392875
12	13405493416599700058947500
13	9835107221539462476348118125
14	8316889511005794888839427108750
15	8030850428074789829954674314399375

[0, 1, 34, 1891, 164196, 20760741, 3616621254, 832001250375, 244557191709000, 89472598178279625, 39886085958271670250, 21288783013213520392875, 13405493416599700058947500, 9835107221539462476348118125, 8316889511005794888839427108750, 8030850428074789829954674314399375]

cp's OEIS Frontend

A335090 a(n) = ((2n+1)!!)^2 (Sum_{k=1..n} 1/(2*k+1)^2).

Table of values

List of values

cp's OEIS Frontend

A335090 a(n) = ((2*n+1)!!)^2 * (Sum_{k=1..n} 1/(2*k+1)^2).

Table of values

List of values

A335090 a(n) = ((2n+1)!!)^2 (Sum_{k=1..n} 1/(2*k+1)^2).