1,6

Row sums = A000081 starting with offset 2: (1, 2, 4, 9, 20, 48, 115,...)

Right border = (1, 1, 2, 4, 9, 20, 48,...).

Left border = A051573: (1, 1, 1, 2, 3, 8, 16, 41,...)

Sum of n-th row terms = rightmost term of next row.

Eigentriangle by rows, termwise products of A000081 starting with offset 2: (1, 2, 4, 9, 20, 48,...) and row terms of an A051573 decrescendo triangle: (1; 1,1; 1,1,1; 2,1,1,1; 3,2,1,1,1;...) where A051573 = (1, 1, 1, 2, 3, 8, 16, 41,...).

First few rows of the triangle =

1;

1, 1;

1, 1, 2;

2, 1, 2, 4;

3, 2, 2, 4, 9;

8, 3, 4, 4, 9, 20;

16, 8, 6, 8, 9, 20, 48;

41, 16, 16, 12, 18, 20, 48, 115;

98, 41, 32, 3227, 40, 48, 115, 286;

...

Row 4 = (2, 1, 2, 4) = termwise products of (2, 1, 1, 1) and (1, 1, 2, 4).

Sequence in context: A029262 A129687 A128176 this_sequence A035374 A048299 A144218

Adjacent sequences: A144960 A144961 A144962 this_sequence A144964 A144965 A144966

eigen,nonn,tabl

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 27 2008