A203151 - cp's OEIS frontend

A203151 (n-1)-st elementary symmetric function of {1,1,2,2,3,3,4,4,5,5,...,Floor[(n+1)/2]}.

n	a(n)
1	1
2	2
3	5
4	12
5	40
6	132
7	564
8	2400
9	12576
10	65760
11	408960
12	2540160
13	18299520
14	131725440
15	1079205120
16	8836853760
17	81157386240
18	745047797760
19	7582159872000
20	77138417664000
21	861690783744000
22	9623448705024000
23	117074735382528000

[1, 2, 5, 12, 40, 132, 564, 2400, 12576, 65760, 408960, 2540160, 18299520, 131725440, 1079205120, 8836853760, 81157386240, 745047797760, 7582159872000, 77138417664000, 861690783744000, 9623448705024000, 117074735382528000]

cp's OEIS Frontend

A203151 (n-1)-st elementary symmetric function of {1,1,2,2,3,3,4,4,5,5,...,Floor[(n+1)/2]}.

Table of values

List of values