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 A226549 #8 Sep 05 2021 22:00:54 %S A226549 0,6,96,654,4938,33502,221672,1426734,9014839,56128696,345447208, %T A226549 2106033948,12739126739,76548375758,457375097789,2719454021744, %U A226549 16100269337597,94961606031670,558226473615469,3271710478901046,19123726111508773,111510459865449832 %N A226549 Number of squares in all tilings of a 6 X n rectangle using integer-sided square tiles. %H A226549 Alois P. Heinz, <a href="/A226549/b226549.txt">Table of n, a(n) for n = 0..1000</a> %F A226549 G.f.: (4*x^23 +60*x^22 +203*x^21 +308*x^20 -35*x^19 -660*x^18 -964*x^17 -612*x^16 +239*x^15 +344*x^14 +683*x^13 +686*x^12 +1156*x^11 +1944*x^10 -341*x^9 -2280*x^8 -1775*x^7 +588*x^6 +1550*x^5 +70*x^4 -498*x^3 -48*x^2 +60*x+6)*x / (2*x^15 +7*x^14 +12*x^13 +6*x^12 -18*x^11 -13*x^10 -8*x^9 -27*x^8 -32*x^7 +x^6 +40*x^5 +34*x^4 -3*x^3 -15*x^2 -3*x+1)^2. %Y A226549 Column k=6 of A226545. %Y A226549 Cf. A219925. %K A226549 nonn,easy %O A226549 0,2 %A A226549 _Alois P. Heinz_, Jun 10 2013