

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
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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



