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 A158898 #11 Feb 16 2025 08:33:10 %S A158898 7,35287,113742727,347251215703,1050773495363767,3174564739209417463, %T A158898 9588099190533549457408,28957256518828921149989143, %U A158898 87453655435340440175476698487,264117827347202707929587420182327 %N A158898 Number of spanning trees in C_7 X P_n. %H A158898 Alois P. Heinz, <a href="/A158898/b158898.txt">Table of n, a(n) for n = 1..288</a> %H A158898 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CycleGraph.html">Cycle Graph</a> %H A158898 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PathGraph.html">Path Graph</a> %F A158898 See program. %p A158898 a:= n-> 7* (Matrix([222727, 4031, 71, 1, 0, -1, -71, -4031]). Matrix(8, (i,j)-> if i=j-1 then 1 elif j=1 then [71, -952, 3976, -6384, 3976, -952, 71, -1][i] else 0 fi)^n)[1,5]^2: seq(a(n), n=1..15); %Y A158898 7th column of A173958. %Y A158898 Cf. A001353, A003690, A003753, A003733, A158880. %K A158898 nonn,easy %O A158898 1,1 %A A158898 _Alois P. Heinz_, Mar 29 2009