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 A163270 #2 Mar 30 2012 18:53:09 %S A163270 1,1,1,3,1,3,3,13,1,3,3,13,3,13,13,75,1,3,3,13,3,13,13,75,3,13,13,75, %T A163270 13,75,75,541 %N A163270 First column in matrix inverse of (A047999*A154990). %e A163270 First column in the table: %e A163270 1, %e A163270 1,1, %e A163270 1,0,1, %e A163270 3,1,1,1, %e A163270 1,0,0,0,1, %e A163270 3,1,0,0,1,1, %e A163270 3,0,1,0,1,0,1, %e A163270 13,3,3,1,3,1,1,1, %Y A163270 Cf. It appears that A000670 = A163270(A000079). %K A163270 nonn %O A163270 1,4 %A A163270 _Mats Granvik_, Jul 24 2009