A069955 - cp's OEIS frontend

A069955 Let W(n) = Product_{k=1..n} (1 - 1/4k^2), the partial Wallis product (lim_{n->oo} W(n) = 2/Pi); then a(n) = numerator(W(n)).

n	a(n)
0	1
1	3
2	45
3	175
4	11025
5	43659
6	693693
7	2760615
8	703956825
9	2807136475
10	44801898141
11	178837328943
12	11425718238025
13	45635265151875
14	729232910488125
15	2913690606794775
16	2980705490751054825
17	11912508103174630875
18	190453061649520333125
19	761284675790187924375

[1, 3, 45, 175, 11025, 43659, 693693, 2760615, 703956825, 2807136475, 44801898141, 178837328943, 11425718238025, 45635265151875, 729232910488125, 2913690606794775, 2980705490751054825, 11912508103174630875, 190453061649520333125, 761284675790187924375]

cp's OEIS Frontend

A069955 Let W(n) = Product_{k=1..n} (1 - 1/4k^2), the partial Wallis product (lim_{n->oo} W(n) = 2/Pi); then a(n) = numerator(W(n)).

Table of values

List of values