A382597 - cp's OEIS frontend

A382597 a(n) = Product_{i=1..n} 1 - i + n(n - i + 1) - (n - 2i + 1)*((n - i + 1) mod 2).

n	a(n)
0	1
1	1
2	8
3	105
4	3840
5	181545
6	15814656
7	1635491025
8	261144576000
9	47396578806225
10	12046266925056000
11	3390530144534798265
12	1256223498048110592000
13	506594307608708171477625
14	257699484814807738928332800
15	140934799049120316306629726625
16	94240120920042785192632469422080

[1, 1, 8, 105, 3840, 181545, 15814656, 1635491025, 261144576000, 47396578806225, 12046266925056000, 3390530144534798265, 1256223498048110592000, 506594307608708171477625, 257699484814807738928332800, 140934799049120316306629726625, 94240120920042785192632469422080]

cp's OEIS Frontend

A382597 a(n) = Product_{i=1..n} 1 - i + n(n - i + 1) - (n - 2i + 1)*((n - i + 1) mod 2).

Table of values

List of values

cp's OEIS Frontend

A382597 a(n) = Product_{i=1..n} 1 - i + n*(n - i + 1) - (n - 2*i + 1)*((n - i + 1) mod 2).

Table of values

List of values

A382597 a(n) = Product_{i=1..n} 1 - i + n(n - i + 1) - (n - 2i + 1)*((n - i + 1) mod 2).