%I A001253 M2123 N0840
%S A001253 2,20,198,2048,22468,264538,3340962,45173518,652197968,10024549190
%N A001253 Number of permutations of length n by length of runs.
%D A001253 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001253 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001253 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied 
               Tables, Cambridge, 1966, p. 262.
%Y A001253 Sequence in context: A037566 A125857 A001078 this_sequence A085586 A136902 
               A136884
%Y A001253 Adjacent sequences: A001250 A001251 A001252 this_sequence A001254 A001255 
               A001256
%K A001253 nonn
%O A001253 5,1
%A A001253 N. J. A. Sloane (njas(AT)research.att.com).