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A106342 Matrix inverse of A008278, which is a triangle of Stirling numbers of 2nd kind. 1

%I #3 Mar 30 2012 18:36:46

%S 1,-1,1,2,-3,1,-9,15,-7,1,94,-160,80,-15,1,-2220,3790,-1915,375,-31,1,

%T 114456,-195461,98875,-19460,1652,-63,1,-12542341,21419587,-10836231,

%U 2133635,-181559,7035,-127,1,2868686486,-4899099640,2478483560,-488022556,41534164,-1611120,29360,-255,1

%N Matrix inverse of A008278, which is a triangle of Stirling numbers of 2nd kind.

%C Column 0 is A106343. Row sums are zero after the initial row.

%e Triangle T begins:

%e 1;

%e -1,1;

%e 2,-3,1;

%e -9,15,-7,1;

%e 94,-160,80,-15,1;

%e -2220,3790,-1915,375,-31,1;

%e 114456,-195461,98875,-19460,1652,-63,1;

%e -12542341,21419587,-10836231,2133635,-181559,7035,-127,1; ...

%e Matrix inverse is A008278 and begins:

%e 1;

%e 1,1;

%e 1,3,1;

%e 1,6,7,1;

%e 1,10,25,15,1; ...

%o (PARI) {T(n,k)=(matrix(n+1,n+1,r,c,if(r>=c, sum(m=0,r-c+1,(-1)^(r-c+1-m)*m^r/m!/(r-c+1-m)!)))^-1)[n+1,k+1]}

%Y Cf. A008278, A106340, A106343.

%K sign,tabl

%O 0,4

%A _Paul D. Hanna_, May 01 2005

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Last modified May 3 11:14 EDT 2024. Contains 372207 sequences. (Running on oeis4.)