%I A073400
%S A073400 2,9,33,45,396,831,243,3744,18297,28236,1377,32481,273483,968679,
%T A073400 1210140,8019,268029,3418767,20681811,58920534,62686440,47385,2130138,
%U A073400 38186478,347584284,1683064737,4075425738
%N A073400 Coefficient triangle of polynomials (falling powers) related to convolutions 
               of A001045(n+1), n>=0, (generalized (1,2)-Fibonacci). Companion triangle 
               is A073399.
%C A073400 The row polynomials are q(k,x) := sum(a(k,m)*x^(k-m),m=0..k), k=0,1,2,
               ..
%C A073400 The k-th convolution of U0(n) := A001045(n+1), n>= 0, ((1,2) Fibonacci 
               numbers starting with U0(0)=1) with itself is Uk(n) := A073370(n+k,
               k) = (p(k-1,n)*(n+1)*U0(n+1) + q(k-1,n)*(n+2)*2*U0(n))/(k!*9^k), 
               k=1,2,..., where the companion polynomials p(k,n) := sum(b(k,m)*n^(k-m),
               m=0..k) are the row polynomials of triangle b(k,m)= A073399(k,m).
%H A073400 W. Lang <a href="http://www-itp.physik.uni-karlsruhe.de/~wl/EISpub/A073399_400.text">
               First 7 rows </a>.
%F A073400 Recursion for row polynomials defined in the comments: see A073401.
%e A073400 k=2: U2(n)=((9*n+30)*(n+1)*U0(n+1)+(9*n+33)*(n+2)*2*U0(n))/(2*9^2), cf. 
               A073372.
%e A073400 1; 9,33; 45,396,831; ... (lower triangular matrix a(k,m), k >= m >= 0, 
               else 0).
%Y A073400 Cf. A001045, A073370, A073399, A073401.
%Y A073400 Sequence in context: A139628 A123142 A122097 this_sequence A048498 A150921 
               A150922
%Y A073400 Adjacent sequences: A073397 A073398 A073399 this_sequence A073401 A073402 
               A073403
%K A073400 nonn,easy,tabl
%O A073400 0,1
%A A073400 Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Aug 2, 
               2002