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(n,3).

A126935

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(n,3).

Terms

    a(0) =0a(1) =-12a(2) =-24a(3) =-30a(4) =-24a(5) =0a(6) =48a(7) =126a(8) =240a(9) =396a(10) =600a(11) =858a(12) =1176a(13) =1560a(14) =2016a(15) =2550a(16) =3168a(17) =3876a(18) =4680a(19) =5586a(20) =6600a(21) =7728a(22) =8976a(23) =10350a(24) =11856a(25) =13500a(26) =15288a(27) =17226a(28) =19320a(29) =21576

External references