%I A019448
%S A019448 1,2,5,16,58,231,1016,4782,23653,121727,648611
%N A019448 Number of monomials in expansion of determinant of an n X n Hankel matrix 
               [ t(i+j) ] in terms of its entries.
%F A019448 with(linalg): A019448 := proc(n) local i, j, m; m := array(1..n, 1..n); 
               for i from 1 to n do for j from 1 to n do m[i, j] := a[i+j] od od; 
               nops([coeffs(det(m))]); end;
%t A019448 f[n_] := Length@ Expand@ Det@ Table[t[i + j], {i, n}, {j, n}]; Do[ Print@ 
               f@n, {n, 11}] - from Robert G. Wilson v Sep 17 2006
%Y A019448 Sequence in context: A157612 A149978 A149979 this_sequence A000753 A007878 
               A019589
%Y A019448 Adjacent sequences: A019445 A019446 A019447 this_sequence A019449 A019450 
               A019451
%K A019448 nonn
%O A019448 1,2
%A A019448 Herbert Wilf (wilf(AT)central.cis.upenn.edu)
%E A019448 Maple program and 2 more terms from Jeffrey Shallit (shallit(AT)graceland.uwaterloo.ca), 
               Jun 08 2000
%E A019448 a(10) and a(11) from Robert G. Wilson v Sep 17 2006