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 A140340 #16 Oct 22 2023 06:46:07 %S A140340 29,59,109,179,269,379,509,659,829,1019,1229,1459,1709,1979,76,86,116, %T A140340 166,236,326,436,566,716,886,1076,1286,1516,1766,161,151,161,191,241, %U A140340 311,401,511,641,791,961,1151,1361,1591,284,254,244,254,284,334,404,494,604,734,884,1054,1244,1454 %N A140340 Square array read by rows: T(n,k) = 19*n^2+10*k^2-(n-1)*(20*(k-1)+10), with 14 columns. %e A140340 Array begins: %e A140340 29, 59, 109, 179, 269, 379, 509, 659, 829, 1019, 1229, 1459, 1709, 1979; %e A140340 76, 86, 116, 166, 236, 326, 436, 566, 716, 886, 1076, 1286, 1516, 1766; %e A140340 161, 151, 161, 191, 241, 311, 401, 511, 641, 791, 961, 1151, 1361, 1591; %e A140340 284, 254, 244, 254, 284, 334, 404, 494, 604, 734, 884, 1054, 1244, 1454; %e A140340 445, 395, 365, 355, 365, 395, 445, 515, 605, 715, 845, 995, 1165, 1355; %e A140340 ... %p A140340 T:=(n,k) -> 19*n^2+10*k^2-(n-1)*(20*(k-1)+10); %Y A140340 Cf. A140754 (a very similar array), A140755. %K A140340 nonn,tabf,less %O A140340 1,1 %A A140340 Aldrich Stevens (aldrichstevens(AT)msn.com), May 29 2008 %E A140340 Edited by _Omar E. Pol_ and _N. J. A. Sloane_, Jan 11 2009