This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A182830 #8 Apr 20 2013 04:49:03 %S A182830 2,6,5,18,15,8,54,45,24,11,162,135,72,33,14,486,405,216,99,42,17,1458, %T A182830 1215,648,297,126,51,20,4374,3645,1944,891,378,153,60,23,13122,10935, %U A182830 5832,2673,1134,459,180,69,26,39366,32805,17496 %N A182830 Array of the numbers (3*i+2)*3^j, i>=0, j>=0, read by antidiagonals. %C A182830 (Row 1)=A008776. (Column 1)=A016789. %F A182830 T(i,j)=(3*i+2)*3^j, i>=0, j>=0. %e A182830 Northwest corner: %e A182830 2....6...18...54...162... %e A182830 5...15...45..135...405... %e A182830 8...24...72..216...648... %e A182830 11..33...99..297...891... %Y A182830 Cf. A026179, A182831. %K A182830 nonn,tabl %O A182830 1,1 %A A182830 _Clark Kimberling_, Dec 06 2010