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 A281368 #12 Jan 31 2017 10:21:38 %S A281368 1,2,3,7,17,52,217,1757,35977,3244071,2757063867,68246203026923, %T A281368 265773420092483210413,2042495276699414186047172525299, %U A281368 1376053548027595532701211092865247287361883459,24062832323766390460579042386921003503968575947499150009246321293279 %N A281368 Index of first appearance of n in the triangular-based nachos numbers A281367. %C A281368 Using a similar computation as in A280054. - _Lars Blomberg_, Jan 31 2017 %H A281368 Lars Blomberg, <a href="/A281368/b281368.txt">Table of n, a(n) for n = 1..22</a> %Y A281368 Cf. A280053, A280054, A281367. %K A281368 nonn %O A281368 1,2 %A A281368 _N. J. A. Sloane_, Jan 30 2017 %E A281368 More terms from _Lars Blomberg_, Jan 31 2017