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 A114881 #2 Mar 30 2012 18:57:06 %S A114881 1,2,3,4,8,5,6,24,14,7,10,48,34,20,9,12,120,76,54,26,11,16,168,142,90, %T A114881 64,32,13,18,288,220,186,118,84,38,15,22,360,322,246,208,132,94,44,17, %U A114881 28,528,436,390,298,252,160,114,50,19,30 %N A114881 Sieve of Eratosthenes minus 1. %C A114881 A permutation of the natural numbers; row 1 consists of all odds. %F A114881 A083140(n) - 1 %e A114881 Northwest corner: %e A114881 1 3 5 7 9 %e A114881 2 8 14 20 26 %e A114881 4 24 34 54 64 %e A114881 6 48 76 90 118 %Y A114881 Cf. A083140, A114882, A114883. %K A114881 nonn,tabl %O A114881 1,2 %A A114881 _Clark Kimberling_, Jan 03 2006