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 A249741 #26 Dec 23 2014 00:35:28 %S A249741 1,3,2,5,8,4,7,14,24,6,9,20,34,48,10,11,26,54,76,120,12,13,32,64,90, %T A249741 142,168,16,15,38,84,118,186,220,288,18,17,44,94,132,208,246,322,360, %U A249741 22,19,50,114,160,252,298,390,436,528,28,21,56,124,202,318,376,492,550,666,840,30,23,62,144,216,340,402,526,588,712,898,960,36,25 %N A249741 Sieve of Eratosthenes minus one: a(n) = A083221(n+1) - 1. %H A249741 Antti Karttunen, <a href="/A249741/b249741.txt">Table of n, a(n) for n = 1..3321; the first 81 antidiagonals of the array, flattened</a> %H A249741 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A249741 a(n) = A083221(n+1) - 1. %F A249741 As a composition of related permutations: %F A249741 a(n) = A114881(A038722(n)). %F A249741 a(n) = A249811(A135764(n)). %e A249741 The top left corner of the array: %e A249741 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, %e A249741 2, 8, 14, 20, 26, 32, 38, 44, 50, 56, 62, 68, 74, %e A249741 4, 24, 34, 54, 64, 84, 94, 114, 124, 144, 154, 174, 184, %e A249741 6, 48, 76, 90, 118, 132, 160, 202, 216, 258, 286, 300, 328, %e A249741 10, 120, 142, 186, 208, 252, 318, 340, 406, 450, 472, 516, 582, %e A249741 12, 168, 220, 246, 298, 376, 402, 480, 532, 558, 610, 688, 766, %e A249741 16, 288, 322, 390, 492, 526, 628, 696, 730, 798, 900, 1002, 1036, %e A249741 18, 360, 436, 550, 588, 702, 778, 816, 892, 1006, 1120, 1158, 1272, %e A249741 22, 528, 666, 712, 850, 942, 988, 1080, 1218, 1356, 1402, 1540, 1632, %e A249741 28, 840, 898, 1072, 1188, 1246, 1362, 1536, 1710, 1768, 1942, 2058, 2116, %e A249741 ... %o A249741 (Scheme) %o A249741 (define (A249741 n) (- (A083221 (+ n 1)) 1)) %o A249741 ;; Alternative version: %o A249741 (define (A249741 n) (- (A083221bi (A002260 n) (A004736 n)) 1)) %Y A249741 Inverse: A249742. %Y A249741 Transpose: A114881. %Y A249741 Row 1: A005408, Column 1: A006093, Main diagonal: A249743. %Y A249741 Cf. also A002260, A004736, A038722, A083221. %K A249741 nonn,tabl,look %O A249741 1,2 %A A249741 _Antti Karttunen_, Nov 15 2014