A095159 - cp's OEIS frontend

A095159 Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.

n	a(n)
1	1
2	2
3	-5
4	28
5	-81
6	704
7	-325
8	768
9	-20825
10	311296
11	-83349
12	1507328
13	-1334025
14	3145728
15	-5337189
16	130023424
17	-1366504425
18	7516192768
19	-5466528925
20	12884901888
21	-87470372561
22	2954937499648
23	-349899121845
24	12919261626368
25	-22394407746529
26	52776558133248
27	-89580335298125

[1, 2, -5, 28, -81, 704, -325, 768, -20825, 311296, -83349, 1507328, -1334025, 3145728, -5337189, 130023424, -1366504425, 7516192768, -5466528925, 12884901888, -87470372561, 2954937499648, -349899121845, 12919261626368, -22394407746529, 52776558133248, -89580335298125]

cp's OEIS Frontend

A095159 Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.

Table of values

List of values