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 A181350 #3 Jul 23 2012 09:48:35 %S A181350 1,1,1,2,3,2,15,5,210,105,210,35,2310,693,6006,36036,2145,90090, %T A181350 765765,1531530,106590,1711710,5819814,5290740,334639305,30421755, %U A181350 334639305,9561123,74364290,39369330 %N A181350 Denominators of row sums of the triangle (lower triangular matrix) log(F) with F:=A037027 (Fibonacci convolution matrix). %C A181350 The corresponding numerator sequence is A181349. %F A181350 a(n) = denominator(sum(T[n,m], m=0..n)), with the matrix T:=log(F), where F:=A037027. Offset of the lower triangular matrix T is [0,0]. %e A181350 The signed rational sequence A181349(n)/A181350(n) starts with [0, 1, 3, 9/2, 17/3, 15/2, 142/15, 52/5, 2371/210, 1481/105, 3673/210, 576/35, 23341/2310, 10085/693, 344857/6006, 3298871/36036, -296356/2145 ,...]. %K A181350 nonn,easy %O A181350 0,4 %A A181350 _Wolfdieter Lang_, Oct 15 2010