cp's OEIS Frontend

A277810 Square array A(r,c) = A019565(A277820(r,c)), read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.

%I A277810 #8 Nov 05 2016 07:25:38
%S A277810 2,6,3,10,15,30,210,21,14,5,22,1155,462,35,70,858,39,910,55,330,105,
%T A277810 1870,3315,72930,5005,2002,33,42,9699690,5187,2926,85,714,2145,770,7,
%U A277810 46,111546435,238602,11305,248710,3927,390,77,154,4002,87,93763670,21505,152490,440895,3094,91,546,231,7130,13485,620310,1078282205,2306486,9867,114114,17017,170170,1365,2310
%N A277810 Square array A(r,c) = A019565(A277820(r,c)), read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.
%C A277810 Permutation of squarefree numbers (A005117) after their initial term 1.
%H A277810 Antti Karttunen, <a href="/A277810/b277810.txt">Table of n, a(n) for n = 1..1540; the first 55 antidiagonals of the array</a>
%F A277810 A(r,c) = A019565(A277820(r,c)).
%e A277810 The top left corner of the array:
%e A277810     2,    6,     10,   210,      22,    858,      1870,    9699690
%e A277810     3,   15,     21,  1155,      39,   3315,      5187,  111546435
%e A277810    30,   14,    462,   910,   72930,   2926,    238602,   93763670
%e A277810     5,   35,     55,  5005,      85,  11305,     21505, 1078282205
%e A277810    70,  330,   2002,   714,  248710, 152490,   2306486,   60138078
%e A277810   105,   33,   2145,  3927,  440895,   9867,   1870935,  691587897
%e A277810    42,  770,    390,  3094,  114114, 520030,    162690,  581334754
%e A277810     7,   77,     91, 17017,     133,  33649,     50141, 6685349671
%e A277810   154,  546, 170170,   570,    6118, 254562, 357505330,   51269790
%e A277810   231, 1365,   7293,  3135, 1312311, 983535,  11599797,  589602585
%o A277810 (Scheme)
%o A277810 (define (A277810 n) (A277810bi (A002260 n) (A004736 n)))
%o A277810 (define (A277810bi row col) (A019565 (A277820bi row col)))
%Y A277810 Transpose: A277809.
%Y A277810 The topmost row: A123098, the leftmost column: A277811.
%Y A277810 Cf. A005117, A019565, A277820.
%K A277810 nonn,tabl
%O A277810 1,1
%A A277810 _Antti Karttunen_, Nov 01 2016