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 A099731 #6 Jun 16 2016 23:27:25 %S A099731 1,1,-1,1,-5,10,1,-12,59,-90,1,-22,203,-830,1320,1,-35,525,-3985, %T A099731 15374,-23640,1,-51,1135,-13665,93544,-342324,523440,1,-70,2170, %U A099731 -37870,399889,-2542540,8997540,-13633200,1,-92,3794,-90440,1356929,-13076588,78896236,-271996080,409852800,1,-117,6198,-193410 %N A099731 This table shows the coefficients of sum formulas of n-th Fibonacci numbers (A000045). The k-th row (k>=1) contains T(i,k) for i=1 to k, where k=[2*n+1+(-1)^(n-1)]/4 and T(i,k) satisfies F(n)= Sum_{i=1..k} T(i,k) * n^(k-i)/(k-1)!. %e A099731 F(13)=233; substituting n=13 in the formula of the k-th row we obtain k=7 and the coefficients %e A099731 T(i,7) will be the following: 1,-51,1135,-13665,93544,-342324,523440, %e A099731 => F(13) = [13^6-51*13^5+1135*13^4-13665*13^3+93544*13^2-342324*13+523440]/6! = 233. %Y A099731 Cf. A000045, A094638. %K A099731 sign,tabl %O A099731 1,5 %A A099731 _André F. Labossière_, Nov 08 2004