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 A359988 #8 Jan 28 2023 22:07:32 %S A359988 3,105,3665,123215,4051679,131630449,4248037953,136587740399, %T A359988 4382607093471,140457446235441,4498520188148993,144023056568886959, %U A359988 4610014925578108703,147543642097619999089,4721816707356538941633,151105755554498621737583,4835522406931884652356447 %N A359988 Number of edge cuts in the 3 X n grid graph. %H A359988 Andrew Howroyd, <a href="/A359988/b359988.txt">Table of n, a(n) for n = 1..200</a> %H A359988 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (54,-777,2390,-1736,256). %F A359988 a(n) = 54*a(n-1) - 777*a(n-2) + 2390*a(n-3) - 1736*a(n-4) + 256*a(n-5) for n > 5. %F A359988 G.f.: x*(3 - 57*x + 326*x^2 - 280*x^3 + 32*x^4)/((1 - 32*x)*(1 - 22*x + 73*x^2 - 54*x^3 + 8*x^4)). %F A359988 a(n) = A013823(n-1) - A158453(n). %o A359988 (PARI) Vec((3 - 57*x + 326*x^2 - 280*x^3 + 32*x^4)/((1 - 32*x)*(1 - 22*x + 73*x^2 - 54*x^3 + 8*x^4)) + O(x^20)) %Y A359988 Row 3 of A359990. %Y A359988 Cf. A013823, A158453, A359987. %K A359988 nonn,easy %O A359988 1,1 %A A359988 _Andrew Howroyd_, Jan 28 2023