cp's OEIS Frontend

A276620 Square array A(row,col) = A276610(row,col+1) - A276610(row,col): the first differences of each row of array A276610, read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

%I A276620 #10 Sep 15 2016 12:23:23
%S A276620 4,4,8,4,10,10,4,8,12,20,4,10,12,20,16,4,8,12,22,12,24,4,10,10,24,16,
%T A276620 26,38,4,8,10,24,14,30,40,20,4,10,14,22,14,20,38,18,34,4,8,10,16,12,
%U A276620 32,34,14,22,40,4,10,10,22,20,26,38,22,34,68,36,4,8,12,28,14,18,40,14,26,46,36,22,4,10,12,20,8,30,48,12,30,74,28,14,34
%N A276620 Square array A(row,col) = A276610(row,col+1) - A276610(row,col): the first differences of each row of array A276610, read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...
%C A276620 The first negative term occurs as a(490) = A(25,7) = A276610(25,8) - A276610(25,7) = 248 - 258 = -10.
%H A276620 Antti Karttunen, <a href="/A276620/b276620.txt">Table of n, a(n) for n = 1..10440; the first 144 antidiagonals of array</a>
%F A276620 A(row,col) = A276610(row,col+1) - A276610(row,col).
%e A276620 The top left 18 x 16 corner of the array:
%e A276620    4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4
%e A276620    8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10
%e A276620   10, 12, 12, 12, 10, 10, 14, 10, 10, 12, 12, 12, 10, 10, 14, 10, 10, 12
%e A276620   20, 20, 22, 24, 24, 22, 16, 22, 28, 20, 22, 20, 20, 26, 20, 22, 24, 22
%e A276620   16, 12, 16, 14, 14, 12, 20, 14,  8, 22, 12, 12, 18, 12, 12, 18, 14, 14
%e A276620   24, 26, 30, 20, 32, 26, 18, 30, 28, 22, 28, 30, 28, 20, 30, 24, 28, 26
%e A276620   38, 40, 38, 34, 38, 40, 48, 34, 32, 40, 40, 36, 40, 44, 36, 40, 36, 32
%e A276620   20, 18, 14, 22, 14, 12, 20, 22, 20, 16, 18, 12, 20, 10, 24, 18, 18, 18
%e A276620   34, 22, 34, 26, 30, 40, 20, 30, 30, 32, 28, 34, 26, 40, 26, 26, 30, 32
%e A276620   40, 68, 46, 74, 52, 48, 70, 40, 64, 66, 46, 58, 58, 48, 58, 62, 58, 52
%e A276620   36, 36, 28, 32, 30, 28, 18, 58, 28, 20, 38, 26, 30, 50, 30, 28, 22, 44
%e A276620   22, 14, 14, 10, 46, 16, 24,  2, 32, 16, 24, 20, 18, 12, 28, 12, 30, 20
%e A276620   34, 32, 46, 32, 16, 46, 30, 30, 30, 54, 34, 26, 34, 26, 30, 38, 40, 18
%e A276620   52, 44, 40, 52, 40, 56, 58, 60, 28, 24, 64, 52, 54, 66, 30, 54, 30, 66
%e A276620   52, 74, 70, 52, 66, 68, 56, 52, 80, 64, 42, 90, 54, 42, 78, 58, 72, 68
%e A276620   42, 46, 58, 64, 38, 38, 62, 52, 44, 62, 52, 28, 62, 52, 50, 50, 42, 52
%o A276620 (Scheme)
%o A276620 (define (A276620 n) (A276620bi (A002260 n) (A004736 n)))
%o A276620 (define (A276620bi row col) (- (A276610bi row (+ 1 col)) (A276610bi row col))) ;; Code for A276610bi given in A276610.
%Y A276620 Transpose: A276619.
%Y A276620 Column 1: A276607.
%Y A276620 Cf. A276610, A255127.
%K A276620 sign,tabl
%O A276620 1,1
%A A276620 _Antti Karttunen_, Sep 13 2016