A129779 - cp's OEIS frontend

A129779 a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2n-5)a(n-1).

n	a(n)
1	1
2	-1
3	2
4	-6
5	30
6	-210
7	1890
8	-20790
9	270270
10	-4054050
11	68918850
12	-1309458150
13	27498621150
14	-632468286450
15	15811707161250
16	-426916093353750
17	12380566707258750
18	-383797567925021250
19	12665319741525701250

[1, -1, 2, -6, 30, -210, 1890, -20790, 270270, -4054050, 68918850, -1309458150, 27498621150, -632468286450, 15811707161250, -426916093353750, 12380566707258750, -383797567925021250, 12665319741525701250]

cp's OEIS Frontend

A129779 a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2n-5)a(n-1).

Table of values

List of values

cp's OEIS Frontend

A129779 a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2*n-5)*a(n-1).

Table of values

List of values

A129779 a(1) = 1, a(2) = -1, a(3) = 2; for n > 3, a(n) = -(2n-5)a(n-1).