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 A245093 #18 Dec 12 2015 13:18:23 %S A245093 1,1,3,1,3,4,1,3,4,7,1,3,4,7,6,1,3,4,7,6,12,1,3,4,7,6,12,8,1,3,4,7,6, %T A245093 12,8,15,1,3,4,7,6,12,8,15,13,1,3,4,7,6,12,8,15,13,18,1,3,4,7,6,12,8, %U A245093 15,13,18,12,1,3,4,7,6,12,8,15,13,18,12,28 %N A245093 Triangle read by rows in which row n lists the first n terms of A000203. %C A245093 Reluctant sequence of A000203. %C A245093 Row sums give A024916. %C A245093 Has a symmetric representation - for more information see A237270. %H A245093 Reinhard Zumkeller, <a href="/A245093/b245093.txt">Rows n = 1..125 of triangle, flattened</a> %F A245093 T(n,k) = A000203(k), 1<=k<=n. %e A245093 Triangle begins: %e A245093 1; %e A245093 1, 3; %e A245093 1, 3, 4; %e A245093 1, 3, 4, 7; %e A245093 1, 3, 4, 7, 6; %e A245093 1, 3, 4, 7, 6, 12; %e A245093 1, 3, 4, 7, 6, 12, 8; %e A245093 1, 3, 4, 7, 6, 12, 8, 15; %e A245093 1, 3, 4, 7, 6, 12, 8, 15, 13; %e A245093 1, 3, 4, 7, 6, 12, 8, 15, 13, 18; %e A245093 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12; %e A245093 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28; %o A245093 (Haskell) %o A245093 import Data.List (inits) %o A245093 a245093 n k = a245093_tabl !! (n-1) !! (k-1) %o A245093 a245093_row n = a245093_tabl !! (n-1) %o A245093 a245093_tabl = tail $ inits $ a000203_list %o A245093 -- _Reinhard Zumkeller_, Dec 12 2015 %Y A245093 Cf. A000203, A024916, A027293, A104765, A140207, A221529, A237270, A237593, A245099, A265652. %K A245093 nonn,tabl,look %O A245093 1,3 %A A245093 _Omar E. Pol_, Jul 15 2014