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A133728 A128174 * A127775. 1
1, 0, 3, 1, 0, 5, 0, 3, 0, 7, 1, 0, 5, 0, 9, 0, 3, 0, 7, 0, 11, 1, 0, 5, 0, 9, 0, 13, 0, 3, 0, 7, 0, 11, 0, 15, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 21, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 0, 23 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row sums = the triangular series: (1, 3, 6, 10, 15, 21, 28, ...), see A000217.

LINKS

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

FORMULA

A128174 * A127775 as infinite lower triangular matrices. Triangle by columns: (2k-1, 0, 2k-1, 0,...) in k-th column.

EXAMPLE

Triangle begins :

1 ;

0, 3 ;

1, 0, 5 ;

0, 3, 0, 7 ;

1, 0, 5, 0, 9 ;

0, 3, 0, 7, 0, 11 ;

1, 0, 5, 0, 9, 0, 13 ;... - From Philippe Deléham, Oct 28 2011

CROSSREFS

Cf. A000217

Sequence in context: A319083 A045406 A143468 * A127627 A154792 A185911

Adjacent sequences:  A133725 A133726 A133727 * A133729 A133730 A133731

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Sep 21 2007

EXTENSIONS

Corrected and extended by Philippe Deléham, Oct 28 2011

STATUS

approved

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Last modified October 18 18:10 EDT 2018. Contains 316323 sequences. (Running on oeis4.)