A132458 - cp's OEIS frontend

A132458 Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2(2n-m)/((m-1)!*m!). Sequence gives P(4,n).

n	a(n)
1	0
2	0
3	0
4	1
5	24
6	200
7	1000
8	3675
9	10976
10	28224
11	64800
12	136125
13	266200
14	490776
15	861224
16	1449175
17	2352000
18	3699200
19	5659776
20	8450649
21	12346200
22	17689000
23	24901800
24	34500851
25	47110624
26	63480000
27	84500000
28	111223125
29	144884376
30	186924024
31	239012200
32	303075375

[0, 0, 0, 1, 24, 200, 1000, 3675, 10976, 28224, 64800, 136125, 266200, 490776, 861224, 1449175, 2352000, 3699200, 5659776, 8450649, 12346200, 17689000, 24901800, 34500851, 47110624, 63480000, 84500000, 111223125, 144884376, 186924024, 239012200, 303075375]

cp's OEIS Frontend

A132458 Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2(2n-m)/((m-1)!*m!). Sequence gives P(4,n).

Table of values

List of values

cp's OEIS Frontend

A132458 Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2*(2*n-m)/((m-1)!*m!). Sequence gives P(4,n).

Table of values

List of values

A132458 Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2(2n-m)/((m-1)!*m!). Sequence gives P(4,n).