A127070 - cp's OEIS frontend

A127070 Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(4,n).

n	a(n)
0	1
1	4
2	10
3	-24
4	-420
5	-960
6	22680
7	201600
8	-1496880
9	-36288000
10	64864800
11	7823692800
12	25297272000
13	-2092278988800
14	-18988521552000
15	690452066304000
16	11457025515936000
17	-277436193914880000
18	-7430805000755136000
19	133809610449715200000
20	5500591866494524800000
21	-76432049488877322240000

[1, 4, 10, -24, -420, -960, 22680, 201600, -1496880, -36288000, 64864800, 7823692800, 25297272000, -2092278988800, -18988521552000, 690452066304000, 11457025515936000, -277436193914880000, -7430805000755136000, 133809610449715200000, 5500591866494524800000, -76432049488877322240000]

cp's OEIS Frontend

A127070 Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(4,n).

Table of values

List of values