A278564 - OEIS

A278564

Irregular triangle read by rows: row n lists (negated) determinants of the quadratic Farey series of order n.

1, 1, 3, 1, 1, 2, 3, 2, 1, 1, 2, 3, 1, 5, 1, 3, 2, 1, 1, 2, 2, 3, 2, 5, 2, 3, 2, 2, 1, 1, 2, 2, 3, 1, 4, 2, 1, 7, 1, 2, 4, 1, 3, 2, 2, 1, 1, 2, 2, 2, 3, 1, 5, 1, 2, 1, 7, 1, 2, 1, 5, 1, 3, 2, 2, 2, 1, 1, 2, 2, 2, 3, 1, 4, 2, 5, 2, 3, 1, 1, 9, 1, 1, 3, 2, 5, 2, 4, 1, 3, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 1, 4, 2, 1, 6, 2, 3, 2, 1, 9, 1, 2, 3, 2, 6, 1, 1, 2, 4, 1, 3, 2, 2, 2, 2, 1

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,3

LINKS

Table of n, a(n) for n=2..127.

H. Brown, K. Mahler, A generalization of Farey sequences: Some exploration via the computer, Journal of Number Theory 3.3 (1971): 364-370.

EXAMPLE

Triangle begins:

1,3,1,

1,2,3,2,1,

1,2,3,1,5,1,3,2,1,

1,2,2,3,2,5,2,3,2,2,1,