%I A081491
%S A081491 1,2,3,4,6,8,9,12,15,18,19,23,27,31,35,36,41,46,51,56,61,62,68,74,80,86,
%T A081491 92,98,99,106,113,120,127,134,141,148,149,157,165,173,181,189,197,205,
%U A081491 213,214,223,232,241,250,259,268,277,286,295,296,306,316,326,336,346
%N A081491 Triangle read by rows in which the n-th row contains n terms of an arithmetic 
               progression with a common difference of (n-1) and the first term 
               of (n+1)-th row is 1 more than the last term of the n-th row.
%e A081491 1; 2,3; 4,6,8; 9,12,15,18; 19,23,27,31,35; 36,41,46,51,56,61; ...
%Y A081491 Cf. A002522, A005408, A081489, A081490, A081492.
%Y A081491 Sequence in context: A006446 A002348 A019469 this_sequence A161826 A048716 
               A010434
%Y A081491 Adjacent sequences: A081488 A081489 A081490 this_sequence A081492 A081493 
               A081494
%K A081491 nonn
%O A081491 1,2
%A A081491 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2003
%E A081491 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 
               29 2003