Let d(m, 0) = 1, d(m, 1) = m, and d(m, k) = (m - k + 1)*d(m+1, k-1) - (k-1)*(m+1) d(m+2, k-2). Sequence gives d(3,n).
A127068
Let d(m, 0) = 1, d(m, 1) = m, and d(m, k) = (m - k + 1)*d(m+1, k-1) - (k-1)*(m+1) d(m+2, k-2). Sequence gives d(3,n).
Terms
- a(0) =1a(1) =3a(2) =4a(3) =-30a(4) =-216a(5) =420a(6) =14400a(7) =22680a(8) =-1411200a(9) =-8482320a(10) =195955200a(11) =2399997600a(12) =-36883123200a(13) =-788107320000
External references
- oeis: A127068