A152227 Eigentriangle, row sums = A002426.

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, 393254, 102, 126, 126, 152, 204, 282, 786, 1107, 646, 254, 306, 2944, 342, 408, 564, 786, 2214, 3139

Offset: 1

Author

Gary W. Adamson, Nov 29 2008

Keywords

• nonn
• tabl

Comments

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.

Examples

			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)
		

Formula

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.