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 A231330 #19 Jul 21 2025 02:41:04 %S A231330 0,1,1,3,2,4,8,3,5,7,9,11,21,5,7,11,13,17,19,23,25,29,55,8,10,12,16, %T A231330 18,22,24,26,30,32,34,36,44,46,50,60,64,66,76,144,13,17,19,23,25,29, %U A231330 31,35,37,41,43,47,49,53,55,61,65,67,71,73,77,79,83,89,95 %N A231330 Table of distinct terms in rows of triangle A230871, in natural order. %C A231330 A230872 gives the union of all rows; %C A231330 A231335(n) = number of Fibonacci numbers in row n. %H A231330 Reinhard Zumkeller, <a href="/A231330/b231330.txt">Rows n = 0..14 of triangle, flattened</a> %e A231330 Initial rows: %e A231330 . 0: 0; %e A231330 . 1: 1; %e A231330 . 2: 1,3; %e A231330 . 3: 2,4,8 from A230871(3,*) = [2,2,4,8]; %e A231330 . 4: 3,5,7,9,11,21 from A230871(4,*) = [3,5,3,5,7,9,11,21]; %e A231330 . 5: 5,7,11,13,17,19,23,25,29,55; %e A231330 . 6: 8,10,12,16,18,22,24,26,30,32,34,36,44,46,50,60,64,66,76,144. %o A231330 (Haskell) %o A231330 import Data.List (sort, nub) %o A231330 a231330 n k = a231330_tabf !! n !! k %o A231330 a231330_row n = a231330_tabf !! n %o A231330 a231330_tabf = map (sort . nub) a230871_tabf %Y A231330 Cf. A231331 (row lengths), A000045 (left edge), A001906 (right edge). %K A231330 nonn,look,tabf %O A231330 0,4 %A A231330 _Reinhard Zumkeller_, Nov 07 2013