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 A165416 #15 Jul 17 2015 05:56:44 %S A165416 1,1,2,1,3,1,2,4,1,2,5,1,2,3,6,1,3,7,1,2,4,8,1,2,4,9,1,2,5,10,1,2,3,5, %T A165416 11,1,2,3,4,6,12,1,2,3,5,6,13,1,2,3,6,7,14,1,3,7,15,1,2,4,8,16,1,2,4, %U A165416 8,17,1,2,4,9,18,1,2,3,4,9,19,1,2,4,5,10,20,1,2,5,10,21,1,2,3,5,6,11,22,1 %N A165416 Irregular array read by rows: The n-th row contains those distinct positive integers that each, when written in binary, occurs as a substring in binary n. %C A165416 This is sequence A119709 with the 0's removed. %C A165416 The n-th row of this sequence contains A122953(n) terms. %H A165416 Reinhard Zumkeller, <a href="/A165416/b165416.txt">Rows n = 1..512 of table, flattened</a> %e A165416 6 in binary is 110. The distinct positive integers that occur as substrings in n when they and n are written in binary are: 1 (1 in binary), 2 (10 in binary), 3 (11 in binary), and 6 (110 in binary). So row 6 is (1,2,3,6). %o A165416 (Haskell) %o A165416 a165416 n k = a165416_tabf !! (n-1) !! (k-1) %o A165416 a165416_row n = a165416_tabf !! (n-1) %o A165416 a165416_tabf = map (dropWhile (== 0)) $ tail a119709_tabf %o A165416 -- _Reinhard Zumkeller_, Aug 14 2013 %Y A165416 Cf. A119709, A122953. %Y A165416 Cf. A030308. %Y A165416 Cf. A165153 (row products), A225243 (subsequence). %K A165416 base,nonn,tabf,look %O A165416 1,3 %A A165416 _Leroy Quet_, Sep 17 2009 %E A165416 Extended by _Ray Chandler_, Mar 13 2010