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 A175062 #7 Mar 11 2014 01:32:50 %S A175062 1,1,2,2,1,1,3,2,1,2,3,2,3,1,2,1,3,3,2,1,3,1,2,1,4,2,3,1,4,3,2,1,3,2, %T A175062 4,1,3,4,2,1,2,3,4,1,2,4,3,2,4,1,3,2,4,3,1,2,3,1,4,2,3,4,1,2,1,3,4,2, %U A175062 1,4,3,3,4,1,2,3,4,2,1,3,2,1,4,3,2,4,1,3,1,2,4,3,1,4,2,4,3,1,2,4,3,2,1,4,2 %N A175062 An arrangement of permutations. Irregular table read by rows: Read A175061(n) in binary from left to right. Row n contains the lengths of the runs of 0's and 1's. %C A175062 Let F(n) = sum{k=1 to n} k!. Then rows F(n-1)+1 to F(n) are the permutations of (1,2,3,...,n). (And each row in this range is made up of exactly n terms, obviously.) %e A175062 A175061(10) = 536 in binary is 1000011000. This contains a run of one 1, followed by a run of four 0's, followed by a run of two 1's, followed finally by a run of three 0's. So row 10 consists of the run lengths (1,4,2,3), a permutation of (1,2,3,4). %Y A175062 Cf. A175061 %K A175062 base,nonn,tabf %O A175062 1,3 %A A175062 _Leroy Quet_, Dec 12 2009 %E A175062 Extended by _Ray Chandler_, Dec 16 2009