A112463 Absolute value of coefficient of term [x^(n-7)] in characteristic polynomial of maximum matrix A of size n X n, where n >= 7. Maximum matrix A(i,j) is MAX(i,j), where indices i and j run from 1 to n.

7, 111, 930, 5480, 25500, 99756, 341088, 1046520, 2936070, 7638950, 18631932, 42969336, 94348300, 198354300, 401166000, 783610920, 1483311285, 2728813725, 4891144350, 8560278000, 14656684680, 24591569640, 40493836800, 65527390800, 104329399500, 163608855372

Offset

7,1

Links

Table of n, a(n) for n=7..32.

Formula

a(n) = ((13*n+7)/14!) * Product_{i=-6..6} (n+i).

G.f.: x^7*(7+6*x)/(1-x)^15. - Colin Barker, Mar 28 2012

Prog

(Octave, MATLAB) for n=7:20 a = zeros(n); for i=1:n for j=1:n a(i, j) = max(i, j); end end b = poly(a); b(8) end

Crossrefs

Cf. A000217, A000914, A001844, A112459, A112460, A112461, A112462, A112464.

Sequence in context: A357393 A371315 A212371 * A009471 A301990 A193441

Adjacent sequences: A112460 A112461 A112462 * A112464 A112465 A112466

Keyword

easy,nonn

Author

Paul Max Payton, Sep 23 2005

Extensions

Offset changed by Alois P. Heinz, Mar 28 2012

Status

approved