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).
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).
Terms
- a(0) =1a(1) =4a(2) =10a(3) =-24a(4) =-420a(5) =-960a(6) =22680a(7) =201600a(8) =-1496880a(9) =-36288000a(10) =64864800a(11) =7823692800a(12) =25297272000
External references
- oeis: A127070