%I A107668
%S A107668 1,4,45,816,20225,632700,23836540,1048592640,52696514169,2976295383100,
%T A107668 186548057815801,12845016620629488,963644465255618276,
%U A107668 78224633235142116240,6830914919397129328500,638477522900795994967040
%N A107668 Column 0 of triangle A107667.
%C A107668 Shift right of column 1 of triangle A107670, which is the matrix square 
               of triangle A107667.
%F A107668 a(n) = (n+1)^2*A107669(n).
%o A107668 (PARI) {a(n)=local(A);if(n==0,n+1,A=(n+1)*x+x*O(x^n); for(k=0,n,A+=polcoeff(A,
               k)*x^k*(n+1-prod(i=0,k,1+(i-n-1)*x))); polcoeff(A,n))}
%Y A107668 Cf. A107667, A107669, A107670.
%Y A107668 Sequence in context: A039657 A114473 A126747 this_sequence A158887 A126452 
               A082765
%Y A107668 Adjacent sequences: A107665 A107666 A107667 this_sequence A107669 A107670 
               A107671
%K A107668 nonn
%O A107668 0,2
%A A107668 Paul D. Hanna (pauldhanna(AT)juno.com), Jun 07 2005