



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: (2k1, 0, 2k1, 0,...) in kth 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



