

A124744


Expansion of (1+x*y)/(1x^2*y^2+x^3*y^2).


4



1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 1, 3, 1, 0, 0, 0, 0, 0, 0, 3, 3, 1, 0, 0, 0, 0, 0, 0, 1, 3, 4, 1, 0, 0, 0, 0, 0, 0, 0, 1, 6, 4, 1
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,20


COMMENTS



LINKS



FORMULA

Number triangle T(n,k)=C(floor(k/2),nk)*(1)^(nk)
Column k has g.f. x^k*(1x)^floor(k/2).  Paul Barry, Feb 01 2007


EXAMPLE

Triangle begins
1,
0, 1,
0, 0, 1,
0, 0, 1, 1,
0, 0, 0, 1, 1,
0, 0, 0, 0, 2, 1,
0, 0, 0, 0, 1, 2, 1,
0, 0, 0, 0, 0, 1, 3, 1,
0, 0, 0, 0, 0, 0, 3, 3, 1,
0, 0, 0, 0, 0, 0, 1, 3, 4, 1,
0, 0, 0, 0, 0, 0, 0, 1, 6, 4, 1


CROSSREFS



KEYWORD



AUTHOR



STATUS

approved



