A343581 - cp's OEIS frontend

A343581 a(n) = binomial(n, floor(n/2))*FallingFactorial(n - 1, n - floor(n/2)).

n	a(n)
0	1
1	0
2	2
3	6
4	36
5	240
6	1200
7	12600
8	58800
9	846720
10	3810240
11	69854400
12	307359360
13	6849722880
14	29682132480
15	779155977600
16	3339239904000
17	100919250432000
18	428906814336000
19	14668613050291200
20	61934143990118400
21	2364758225077248000
22	9931984545324441600
23	418798681661180620800

[1, 0, 2, 6, 36, 240, 1200, 12600, 58800, 846720, 3810240, 69854400, 307359360, 6849722880, 29682132480, 779155977600, 3339239904000, 100919250432000, 428906814336000, 14668613050291200, 61934143990118400, 2364758225077248000, 9931984545324441600, 418798681661180620800]

cp's OEIS Frontend

A343581 a(n) = binomial(n, floor(n/2))*FallingFactorial(n - 1, n - floor(n/2)).

Table of values

List of values