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 A042933 #13 Jun 26 2022 23:51:36 %S A042933 1,1,2,5,22,181,203,790,993,30580,31573,125299,156872,1380275,5677972, %T A042933 12736219,18414191,31150410,1949739611,1980890021,3930629632, %U A042933 9842149285,43299226772,356235963461,399535190233,1554841534160,1954376724393,60186143265950,62140519990343 %N A042933 Denominators of continued fraction convergents to sqrt(998). %H A042933 Vincenzo Librandi, <a href="/A042933/b042933.txt">Table of n, a(n) for n = 0..200</a> %H A042933 <a href="/index/Rec#order_36">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1968153802, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1). %F A042933 a(n) = 1968153802*a(n-18) - a(n-36) for n > 35. - _Vincenzo Librandi_, Feb 01 2014 %t A042933 Denominator[Convergents[Sqrt[998], 30]] (* _Vincenzo Librandi_, Feb 01 2014 *) %Y A042933 Cf. A042932, A040966. %K A042933 nonn,frac,easy %O A042933 0,3 %A A042933 _N. J. A. Sloane_ %E A042933 More terms from _Vincenzo Librandi_, Feb 01 2014