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A152227 Eigentriangle, row sums = A002426 1
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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.

LINKS

Table of n, a(n) for n=1..54.

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.

EXAMPLE

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)

CROSSREFS

Sequence in context: A226916 A003113 A225502 * A246583 A244788 A078660

Adjacent sequences:  A152224 A152225 A152226 * A152228 A152229 A152230

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 29 2008

STATUS

approved

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Last modified February 21 07:18 EST 2018. Contains 299390 sequences. (Running on oeis4.)