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 A277809 #8 Nov 05 2016 07:25:27 %S A277809 2,3,6,30,15,10,5,14,21,210,70,35,462,1155,22,105,330,55,910,39,858, %T A277809 42,33,2002,5005,72930,3315,1870,7,770,2145,714,85,2926,5187,9699690, %U A277809 154,77,390,3927,248710,11305,238602,111546435,46,231,546,91,3094,440895,152490,21505,93763670,87,4002,2310,1365,170170,17017,114114,9867,2306486,1078282205,620310,13485,7130 %N A277809 Transpose of square array A277810. %C A277809 See A277810. %H A277809 Antti Karttunen, <a href="/A277809/b277809.txt">Table of n, a(n) for n = 1..1275; the first 50 antidiagonals of the array</a> %F A277809 A(r,c) = A019565(A277819(r,c)). %e A277809 The top left corner of the array: %e A277809 2, 3, 30, 5, 70, 105, 42, 7, 154 %e A277809 6, 15, 14, 35, 330, 33, 770, 77, 546 %e A277809 10, 21, 462, 55, 2002, 2145, 390, 91, 170170 %e A277809 210, 1155, 910, 5005, 714, 3927, 3094, 17017, 570 %e A277809 22, 39, 72930, 85, 248710, 440895, 114114, 133, 6118 %e A277809 858, 3315, 2926, 11305, 152490, 9867, 520030, 33649, 254562 %e A277809 1870, 5187, 238602, 21505, 2306486, 1870935, 162690, 50141, 357505330 %o A277809 (Scheme) (define (A277809 n) (A277810bi (A004736 n) (A002260 n))) ;; Code for A277810bi given in A277810. %Y A277809 Transpose: A277810. %Y A277809 The topmost row: A277811, the leftmost column: A123098. %Y A277809 Permutation of squarefree numbers (A005117) after their initial term 1. %Y A277809 Cf. A019565, A277819. %K A277809 nonn,tabl %O A277809 1,1 %A A277809 _Antti Karttunen_, Nov 01 2016