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A176919 Triangle by columns: (1, 2, 3,...) in each column interleaved with (0, 1, 2,...)zeros. Columns >1 shifted down twice. 1
1, 2, 0, 3, 1, 0, 4, 0, 0, 0, 5, 2, 1, 0, 0, 6, 0, 0, 0, 0, 0, 7, 3, 0, 1, 0, 0, 0, 8, 0, 2, 0, 0, 0, 0, 0, 9, 4, 0, 0, 1, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums of n-th row = A065608(n+1).

LINKS

Table of n, a(n) for n=1..78.

FORMULA

Triangle, left border = (1, 2, 3,...). Each successive column is shifted down twice from previous column and interleaved with k zeros.

EXAMPLE

First few rows of the triangle =

1;

2, 0;

3, 1, 0;

4, 0, 0, 0;

5, 2, 1, 0, 0;

6, 0, 0, 0, 0, 0;

7, 3, 0, 1, 0, 0, 0;

8, 0, 2, 0, 0, 0, 0, 0;

9, 4, 0, 0, 1, 0, 0, 0, 0;

10, 0, 0, 0, 0, 0, 0, 0, 0, 0;

11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0;

12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;

13, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0;

14, 0, 4, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0;

15, 7, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0;

16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;

17, 8, 5, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0;

18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;

19, 9, 0, 4, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0;

...

CROSSREFS

Cf. A065608

Sequence in context: A054372 A070679 A177443 * A220645 A127374 A098862

Adjacent sequences:  A176916 A176917 A176918 * A176920 A176921 A176922

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson & Mats Granvik, Apr 29 2010

STATUS

approved

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Last modified August 19 18:33 EDT 2019. Contains 326133 sequences. (Running on oeis4.)