0,3

It is conjectured that all elements of this triangle are integers. It appears that the row sums are the ruler function A001511.

Triangle begins

1,

0, 2,

0, -2, 3,

0, 2, -3, 4,

0, 0, 0, -4, 5,

0, -2, 3, 0, -5, 6,

0, 0, 0, 0, 0, -6, 7,

0, 2, -3, 4, 0, 0, -7, 8,

0, 0, 0, 0, 0, 0, 0, -8, 9,

0, 0, 0, -4, 5, 0, 0, 0, -9, 10,

0, 0, 0, 0, 0, 0, 0, 0, 0, -10, 11,

0, -2, 3, 0, -5, 6, 0, 0, 0, 0, -11, 12,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -12, 13

Triangle is the inverse of the triangle

1,

0, 1/2,

0, 1/3, 1/3,

0, 0, 1/4, 1/4,

0, 0, 1/5, 1/5, 1/5,

0, 0, 0, 1/6, 1/6, 1/6,

0, 0, 0, 1/7, 1/7, 1/7, 1/7,

0, 0, 0, 0, 1/8, 1/8, 1/8, 1/8,

0, 0, 0, 0, 1/9, 1/9, 1/9, 1/9, 1/9,

0, 0, 0, 0, 0, 1/10, 1/10, 1/10, 1/10, 1/10,

0, 0, 0, 0, 0, 1/11, 1/11, 1/11, 1/11, 1/11, 1/11

Sequence in context: A058623 A111565 A141099 this_sequence A137510 A067871 A060155

Adjacent sequences: A127707 A127708 A127709 this_sequence A127711 A127712 A127713

sign,tabl

Paul Barry (pbarry(AT)wit.ie), Jan 24 2007