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 A178535 #10 Feb 23 2024 04:25:25 %S A178535 1,-2,1,-1,-1,1,0,-1,-1,1,-1,-1,0,-1,1,1,0,-2,0,-1,1,-1,-1,0,-1,0,-1, %T A178535 1,0,0,0,-1,-1,0,-1,1,0,0,-1,-1,0,-1,0,-1,1,1,0,-1,1,-2,0,-1,0,-1,1, %U A178535 -1,-1,0,-1,0,-1,0,-1,0,-1,1,0,1,1,-1,0,-1,-1,0,-1,0,-1,1,-1,-1,0,-1,0,-1,0,-1,0,-1,0,-1,1 %N A178535 Matrix inverse of A178534. %C A178535 Except for first term row sums equal a signed version of A023022. %e A178535 Table begins: %e A178535 1 %e A178535 -2 1 %e A178535 -1 -1 1 %e A178535 0 -1 -1 1 %e A178535 -1 -1 0 -1 1 %e A178535 1 0 -2 0 -1 1 %e A178535 -1 -1 0 -1 0 -1 1 %e A178535 0 0 0 -1 -1 0 -1 1 %e A178535 0 0 -1 -1 0 -1 0 -1 1 %e A178535 1 0 -1 1 -2 0 -1 0 -1 1 %e A178535 -1 -1 0 -1 0 -1 0 -1 0 -1 1 %p A178535 A178535 := proc(n, l) %p A178535 option remember; %p A178535 a := 0 ; %p A178535 if n = l then %p A178535 a := 1 ; %p A178535 end if; %p A178535 for k from l to n-1 do %p A178535 a := a-A178534(n, k)*procname(k, l) ; %p A178535 end do: %p A178535 a/A178534(n, n) ; %p A178535 end proc: %p A178535 seq(seq(A178535(n,k),k=1..n),n=1..12) ; # _R. J. Mathar_, Oct 28 2010 %t A178535 nmax = 13; %t A178535 (* T is A178534 *) %t A178535 T[n_, 1] := Fibonacci[n+1]; %t A178535 T[n_, k_] := T[n, k] = If[k > n, 0, Sum[T[n-i, k-1], {i, 1, k-1}] - Sum[T[n-i, k], {i, 1, k-1}]]; %t A178535 A178535 = Inverse[Array[T, {nmax, nmax}]]; %t A178535 Table[A178535[[n, k]], {n, 1, nmax}, {k, 1, n}] // Flatten (* _Jean-François Alcover_, Feb 23 2024 *) %Y A178535 Cf. First column is A178536. %K A178535 sign,tabl %O A178535 1,2 %A A178535 _Mats Granvik_, May 29 2010