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 A163254 #12 Jan 05 2025 19:51:39 %S A163254 2,5,3,10,7,6,17,13,11,8,26,21,18,14,12,37,31,27,22,19,15,50,43,38,32, %T A163254 28,23,20,65,57,51,44,39,33,29,24,82,73,66,58,52,45,40,34,30,101,91, %U A163254 83,74,67,59,53,46,41,35,122,111,102,92,84,75,68,60,54 %N A163254 Array of the nonsquares; the columns satisfy c(n)=c(n-1)+c(n-2)-c(n-3)+1. %C A163254 This is the array remaining after row 1 is expelled from the array in A163253. %H A163254 Clark Kimberling, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Papers1/48-1/Kimberling.pdf">Doubly interspersed sequences, double interspersions and fractal sequences</a>, The Fibonacci Quarterly 48 (2010) 13-20. %F A163254 Let S(n,k) for the k-th term in the n-th row. %F A163254 if n is odd, then S(n,k)=k^2+(n-1)k+(n^2+3)/4; %F A163254 if n is even, then S(n,k)=k^2+(n-1)k+(n^2)/4. %e A163254 Corner: %e A163254 2....5...10...17...26 %e A163254 3....7...13...21...31 %e A163254 6...11...18...27...38 %Y A163254 Cf. A000290, A163253, A163255, A163256, A163257, A163258. %K A163254 nonn,tabl %O A163254 1,1 %A A163254 _Clark Kimberling_, Jul 23 2009