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 A127626 #8 Jan 21 2014 16:31:28 %S A127626 1,1,3,1,0,5,1,3,0,8,1,0,0,0,9,1,3,5,0,0,15,1,0,0,0,0,0,13,1,3,0,8,0, %T A127626 0,0,20,1,0,5,0,0,0,0,0,21,1,3,0,0,9,0,0,0,0,27,1,0,0,0,0,0,0,0,0,0, %U A127626 21,1,3,5,8,0,15,0,0,0,0,0,40,1,0,0,0,0,0,0,0,0,0,0,0,25 %N A127626 Triangle T(n,k) = A018804(k) if k|n, else T(n,k)=0. %C A127626 Inverse Mobius transform of a matrix with A018804 in the main diagonal and the rest zeros. %H A127626 Reinhard Zumkeller, <a href="/A127626/b127626.txt">Rows n = 1..125 of triangle, flattened</a> %e A127626 First few rows of the triangle are: %e A127626 1; %e A127626 1, 3; %e A127626 1, 0, 5; %e A127626 1, 3, 0, 8; %e A127626 1, 0, 0, 0, 9; %e A127626 1, 3, 5, 0, 0, 15; %e A127626 ... %o A127626 (Haskell) %o A127626 a127626 n k = a127626_tabl !! (n-1) !! (k-1) %o A127626 a127626_row n = a127626_tabl !! (n-1) %o A127626 a127626_tabl = map %o A127626 (map (\x -> if x == 0 then 0 else a018804 x)) a127093_tabl %o A127626 -- _Reinhard Zumkeller_, Jan 21 2014 %Y A127626 Cf. A051731, A038040 (row sums), A018804 (diagonal). %Y A127626 Cf. A127093. %K A127626 nonn,tabl,easy %O A127626 1,3 %A A127626 _Gary W. Adamson_, Jan 20 2007