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 A061173 #3 Mar 31 2012 13:20:05 %S A061173 3,70,642,4055,20945,95372,398290,1561683,5836190,21001410,73300478, %T A061173 249476600,831342517,2720979140,8768966810,27881856697,87610794135, %U A061173 272424413508,839229287580,2563768831145,7773145679478 %N A061173 One-fourth of fourth column of Lucas bisection triangle (odd part). %C A061173 Numerator of g.f. is row polynomial sum(A061187(3,m)*x^m,m=0..5)/4. %F A061173 a(n)=A060924(n+3, 3)/4. %F A061173 G.f.: (x+1)*(3-2*x)*(1+11*x-11*x^2+4*x^3)/(1-3*x+x^2)^4. %Y A061173 Cf. A005248, 2*A061171, A061172. %K A061173 nonn,easy %O A061173 0,1 %A A061173 _Wolfdieter Lang_, Apr 20 2001