%I A023429
%S A023429 1,1,1,1,1,1,1,2,4,7,11,17,27,44,73,122,204,340,566,
%T A023429 945,1586,2674,4521,7656,12982,22047,37509,63934,
%U A023429 109166,186685,319679,548091,940819,1616830,2781706
%N A023429 Generalized Catalan Numbers.
%t A023429 Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ 
               n-4-k ], {k, 3, n-4} ];
%Y A023429 Cf. A000108, A001006, A004148, A006318.
%Y A023429 Sequence in context: A006999 A005252 A023430 this_sequence A023428 A093911 
               A152398
%Y A023429 Adjacent sequences: A023426 A023427 A023428 this_sequence A023430 A023431 
               A023432
%K A023429 nonn,easy
%O A023429 0,8
%A A023429 Olivier Gerard (olivier.gerard(AT)gmail.com)