%I A047916
%S A047916 1,2,2,6,0,6,8,8,0,24,20,0,0,0,120,12,36,48,0,0,720,42,0,0,0,0,
%T A047916 0,5040,32,64,0,384,0,0,0,40320,54,0,324,0,0,0,0,0,362880,40,200,
%U A047916 0,0,3840,0,0,0,0,3628800,110,0,0,0,0,0,0,0,0,0,39916800,48,144
%N A047916 Triangular array a(n,k) = phi(n/k)*(n/k)^k*k! if k|n else 0 (1<=k<=n).
%D A047916 J. E. A. Steggall, On the numbers of patterns which can be derived from 
               certain elements, Mess. Math., 37 (1907), 56-61.
%e A047916 1; 2,2; 6,0,6; 8,8,0,24; 20,0,0,0,120; 12,36,48,0,0,720; ...
%Y A047916 A064649 gives the row sums.
%Y A047916 Sequence in context: A091085 A011144 A127649 this_sequence A101207 A155818 
               A010245
%Y A047916 Adjacent sequences: A047913 A047914 A047915 this_sequence A047917 A047918 
               A047919
%K A047916 nonn,tabl,nice,easy
%O A047916 1,2
%A A047916 N. J. A. Sloane (njas(AT)research.att.com).