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 A103243 Unreduced numerators of the elements T(n,k)/(n-k)!, read by rows, of the triangular matrix P^-1, which is the inverse of the matrix defined by P(n,k) = (1-(k+1)^3)^(n-k)/(n-k)! for n >= k >= 1. 1
 1, 7, 1, 315, 26, 1, 45682, 2600, 63, 1, 15646589, 675194, 11655, 124, 1, 10567689552, 366349152, 4861458, 37944, 215, 1, 12503979423607, 361884843866, 3882676581, 23641468, 100835, 342, 1, 23841011541867520, 591934698991168, 5318920238688 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Define triangular matrix P by P(n,k) = (-k^3-3k^2-3k)^(n-k)/(n-k)!, then M = P*D*P^-1 = A103237 satisfies: M^3 + 3M^2 + 3M = SHIFTUP(M) where D is the diagonal matrix consisting of {1,2,3,...}. The operation SHIFTUP(M) shifts each column of M up 1 row. Essentially equal to square array A082172 as a triangular matrix. The first column is A082160 (quasi-acyclic automata with 3 inputs). LINKS FORMULA For n > k >= 1: 0 = Sum_{m=k..n} C(n-k, m-k)*(1-(m+1)^3)^(n-m)*T(m, k). For n > k >= 1: 0 = Sum_{j=k..n} C(n-k, j-k)*(1-(k+1)^3)^(j-k)*T(n, j). EXAMPLE Rows of unreduced fractions T(n,k)/(n-k)! begin:   [1/0! ],   [7/1!, 1/0! ],   [315/2!, 26/1!, 1/0! ],   [45682/3!, 2600/2!, 63/1!, 1/0! ],   [15646589/4!, 675194/3!, 11655/2!, 124/1!, 1/0! ],   [10567689552/5!, 366349152/4!, 4861458/3!, 37944/2!, 215/1!, 1/0! ], ... forming the inverse of matrix P where P(n,k) = A103247(n,k)/(n-k)!:   [1/0! ],   [ -7/1!, 1/0! ],   [49/2!, -26/1!, 1/0! ],   [ -343/3!, 676/2!, -63/1!, 1/0! ],   [2401/4!, -17576/3!, 3969/2!, -124/1!, 1/0! ],   [ -16807/5!, 456976/4!, -250047/3!, 15376/2!, -215/1!, 1/0! ], ... PROG (PARI) {T(n, k)=local(P); if(n>=k&k>=1, P=matrix(n, n, r, c, if(r>=c, (1-(c+1)^3)^(r-c)/(r-c)!))); return(if(n

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Last modified May 25 19:13 EDT 2019. Contains 323576 sequences. (Running on oeis4.)