1,2

Row sums = A002426 starting with offset 1: (1, 3, 7, 19, 51, 141, 393,...).

Right border = A002426, left border = A007971

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

Triangle read by rows, M*Q. M = an infinite lower triangular matrix with

A007971 in every column: (1, 2, 2, 4, 8, 18, 42,...); and Q = a matrix with

A002426 as the main diagonal and the rest zeros.

First few rows of the triangle =

1;

2, 1;

2, 2, 3;

4, 2, 6, 7;

8, 4, 6, 14, 19;

18, 8, 12, 14, 38, 51;

42, 18, 24, 28, 38, 102, 141;

102, 42, 54, 56, 76, 102, 282, 393;

254, 102, 126, 126, 152, 204, 282, 786, 1107;

646, 254, 306, 394, 342, 408, 564, 786, 2214, 3139;

...

Row 3 = (4, 2, 6, 7) = termwise products of (4, 2, 2, 1) and (1, 1, 3, 7)

Adjacent sequences: A152224 A152225 A152226 this_sequence A152228 A152229 A152230

Sequence in context: A161256 A161281 A003113 this_sequence A078660 A060177 A048896

nonn,tabl

Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 29 2008