0,17

Reverse and aerate A069270. First column is signed aerated version of A002293. Diagonal sums are A156065.

Triangle begins

1,

0, 1,

0, 0, 1,

0, 0, 0, 1,

-1, 0, 0, 0, 1,

0, -2, 0, 0, 0, 1,

0, 0, -3, 0, 0, 0, 1,

0, 0, 0, -4, 0, 0, 0, 1,

4, 0, 0, 0, -5, 0, 0, 0, 1,

0, 9, 0, 0, 0, -6, 0, 0, 0, 1,

0, 0, 15, 0, 0, 0, -7, 0, 0, 0, 1,

0, 0, 0, 22, 0, 0, 0, -8, 0, 0, 0, 1,

-22, 0, 0, 0, 30, 0, 0, 0, -9, 0, 0, 0, 1

Production matrix is

0, 1,

0, 0, 1,

0, 0, 0, 1,

-1, 0, 0, 0, 1,

0, -1, 0, 0, 0, 1,

0, 0, -1, 0, 0, 0, 1,

0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1

Sequence in context: A083917 A117974 A156062 this_sequence A158757 A085983 A088183

Adjacent sequences: A156061 A156062 A156063 this_sequence A156065 A156066 A156067

easy,sign,tabl

Paul Barry (pbarry(AT)wit.ie), Oct 20 2009