cp's OEIS Frontend

A112464 Absolute value of coefficient of term [x^(n-8)] in characteristic polynomial of maximum matrix A of size n X n, where n >= 8. Maximum matrix A(i,j) is MAX(i,j), where indices i and j run from 1 to n.

%I A112464 #22 Dec 17 2017 08:01:05
%S A112464 8,143,1343,8823,45543,196707,739347,2483547,7599867,21492097,
%T A112464 56794705,141485305,334639305,755863605,1638428805,3422280285,
%U A112464 6912424485,13541987610,25799313210,47907161610,86882479530,154161302130,268050218130,457369908930,766795640130
%N A112464 Absolute value of coefficient of term [x^(n-8)] in characteristic polynomial of maximum matrix A of size n X n, where n >= 8. Maximum matrix A(i,j) is MAX(i,j), where indices i and j run from 1 to n.
%H A112464 Vincenzo Librandi and Bruno Berselli, <a href="/A112464/b112464.txt">Table of n, a(n) for n = 8..10008</a>
%F A112464 a(n) = ((15n+8)/16!) * Product_{i=-7..7} (n+i).
%F A112464 G.f.: x^8*(8+7*x)/(1-x)^17. - _Harvey P. Dale_, Jul 24 2011
%t A112464 Table[(Times@@(n+Range[0,14])(15n+113))/16!,{n,30}] (* or *) CoefficientList[ Series[ (-8-7 x)/(-1+x)^17,{x,0,30}],x] (* _Harvey P. Dale_, Jul 24 2011 *)
%o A112464 (Octave, MATLAB) for n=8:20 a = zeros(n); for i=1:n for j=1:n a(i,j) = max(i,j); end end b = poly(a); b(9) end
%Y A112464 Cf. A000217, A000914, A001844, A112459, A112460, A112461, A112462, A112463.
%K A112464 easy,nonn
%O A112464 8,1
%A A112464 _Paul Max Payton_, Sep 23 2005
%E A112464 More terms from _Harvey P. Dale_, Jul 24 2011
%E A112464 Offset changed from 0 to 8, formulas and b-file adapted by _Bruno Berselli_, Mar 29 2012