%I A117137
%S A117137 1,1,2,4,1,3,6,2,7,1,4,8,3,9,2,10,1,5,10,4,11,3,12,2,13,1,
%T A117137 6,12,5,13,4,14,3,15,2,16,1,7,14,6,15,5,16,4,17,3,18,2,19,1
%N A117137 Same as triangle in A117136, but omit final 1 from each row.
%C A117137 Row n has length 2n+1.
%e A117137 Triangle begins:
%e A117137 Row 0: 1
%e A117137 Row 1: 1 2 4
%e A117137 Row 2: 1 3 6 2 7
%e A117137 Row 3: 1 4 8 3 9 2 10
%e A117137 Row 4: 1 5 10 4 11 3 12 2 13
%e A117137 ...
%Y A117137 Cf. A117136, A046901, A008344.
%Y A117137 The segments of A046901 appear as rows 2, 7, 22, 67, ... (A060816) of 
               this array.
%Y A117137 Sequence in context: A053451 A141843 A130266 this_sequence A002344 A011233 
               A163360
%Y A117137 Adjacent sequences: A117134 A117135 A117136 this_sequence A117138 A117139 
               A117140
%K A117137 nonn,tabf
%O A117137 0,3
%A A117137 N. J. A. Sloane (njas(AT)research.att.com), Apr 21 2006