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A130026 Triangle (n,k) by columns, arithmetic sequences interspersed with k zeros. 1
1, 2, 1, 3, 0, 1, 4, 3, 0, 1, 5, 0, 0, 0, 1, 6, 5, 4, 0, 0, 1, 7, 0, 0, 0, 0, 0, 1, 8, 7, 0, 5, 0, 0, 0, 1, 9, 0, 7, 0, 0, 0, 0, 0, 1, 10, 9, 0, 0, 6, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A081307: (1, 3, 4, 8, 6, 16, 8, 21, 17,...).

LINKS

Table of n, a(n) for n=0..54.

FORMULA

Arithmetic sequences by columns, (1,2,3,...); (1,3,5,...); (1,4,7,...); interspersed with k zeros, k=0,1,2,...

EXAMPLE

First few rows of the triangle are:

1;

2, 1;

3, 0, 1;

4, 3, 0, 1;

5, 0, 0, 0, 1;

6, 5, 4, 0, 0, 1;

7, 0, 0, 0, 0, 0, 1;

...

CROSSREFS

Cf. A081307, A130027.

Sequence in context: A158951 A126988 A280499 * A113287 A195665 A096798

Adjacent sequences:  A130023 A130024 A130025 * A130027 A130028 A130029

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 02 2007

STATUS

approved

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Last modified November 13 16:08 EST 2019. Contains 329106 sequences. (Running on oeis4.)