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A134839

Triangle, n-th row = first n terms in n-th row of an array formed by A051731 * A126988(transform).

1, 1, 3, 1, 2, 4, 1, 3, 3, 7, 1, 2, 3, 4, 6, 1, 3, 4, 6, 5, 12, 1, 2, 3, 4, 5, 6, 8, 1, 3, 3, 7, 5, 9, 7, 15, 1, 2, 4, 4, 5, 8, 7, 8, 13, 1, 3, 3, 6, 6, 9, 7, 12, 9, 18

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OFFSET

1,3

COMMENTS

Right border = sigma(n), A000203: (1, 3, 4, 7, 6, 12, ...).

Row sums = A007437: (1, 4, 7, 14, 16, 31, 29, 50, ...).

LINKS

Table of n, a(n) for n=1..55.

FORMULA

Given the array formed by A051731 * A126988(transform), the triangle by rows = first n terms of n-th row of the array.

EXAMPLE

First few rows of the array:

1, 2, 3, 4, 5, 6, 7, ...

1, 3, 3, 6, 5, 9, 7, ...

1, 2, 4, 4, 5, 8, 7, ...

1, 3, 3, 7, 5, 9, 7, ...

1, 2, 3, 4, 6, 6, 7, ...

1, 3, 4, 6, 5, 12, 7, ...

...

First few rows of the triangle:

1, 3;

1, 2, 4;

1, 3, 3, 7;

1, 2, 3, 4, 6;

1, 3, 4, 6, 5, 12;

1, 2, 3, 4, 5, 6, 8;

...

CROSSREFS

Cf. A126988, A051731, A000203, A007437.

Sequence in context: A080890 A251621 A016468 * A077581 A130419 A083110

Adjacent sequences: A134836 A134837 A134838 * A134840 A134841 A134842

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 12 2007

STATUS

approved

URL: https://oeis.org/A134839

⇱ A134839 - OEIS