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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), ...
5
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, 26, 38, 4, 8, 10, 24, 14, 30, 40, 20, 4, 10, 14, 22, 14, 20, 38, 18, 34, 4, 8, 10, 16, 12, 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
OFFSET
1,1
COMMENTS
The first negative term occurs as a(490) = A(25,7) = A276610(25,8) - A276610(25,7) = 248 - 258 = -10.
FORMULA
A(row,col) = A276610(row,col+1) - A276610(row,col).
EXAMPLE
The top left 18 x 16 corner of the array:
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10
10, 12, 12, 12, 10, 10, 14, 10, 10, 12, 12, 12, 10, 10, 14, 10, 10, 12
20, 20, 22, 24, 24, 22, 16, 22, 28, 20, 22, 20, 20, 26, 20, 22, 24, 22
16, 12, 16, 14, 14, 12, 20, 14, 8, 22, 12, 12, 18, 12, 12, 18, 14, 14
24, 26, 30, 20, 32, 26, 18, 30, 28, 22, 28, 30, 28, 20, 30, 24, 28, 26
38, 40, 38, 34, 38, 40, 48, 34, 32, 40, 40, 36, 40, 44, 36, 40, 36, 32
20, 18, 14, 22, 14, 12, 20, 22, 20, 16, 18, 12, 20, 10, 24, 18, 18, 18
34, 22, 34, 26, 30, 40, 20, 30, 30, 32, 28, 34, 26, 40, 26, 26, 30, 32
40, 68, 46, 74, 52, 48, 70, 40, 64, 66, 46, 58, 58, 48, 58, 62, 58, 52
36, 36, 28, 32, 30, 28, 18, 58, 28, 20, 38, 26, 30, 50, 30, 28, 22, 44
22, 14, 14, 10, 46, 16, 24, 2, 32, 16, 24, 20, 18, 12, 28, 12, 30, 20
34, 32, 46, 32, 16, 46, 30, 30, 30, 54, 34, 26, 34, 26, 30, 38, 40, 18
52, 44, 40, 52, 40, 56, 58, 60, 28, 24, 64, 52, 54, 66, 30, 54, 30, 66
52, 74, 70, 52, 66, 68, 56, 52, 80, 64, 42, 90, 54, 42, 78, 58, 72, 68
42, 46, 58, 64, 38, 38, 62, 52, 44, 62, 52, 28, 62, 52, 50, 50, 42, 52
PROG
(Scheme)
(define (A276620 n) (A276620bi (A002260 n) (A004736 n)))
(define (A276620bi row col) (- (A276610bi row (+ 1 col)) (A276610bi row col))) ;; Code for A276610bi given in A276610.
CROSSREFS
Transpose: A276619.
Column 1: A276607.
Sequence in context: A273854 A082075 A243641 * A276681 A255485 A322328
KEYWORD
sign,tabl
AUTHOR
Antti Karttunen, Sep 13 2016
STATUS
approved