OFFSET
1,2
COMMENTS
The table starts row n with A000108(n) = C(n) and then visualizes the convolution formula C(n) = sum_{j=0..n-1} C(j)*C(n-1-j) by listing some pairs of that structure in the same row.
EXAMPLE
Starting in row n=1 the table reads
1;
2,1,1;
5,2,1,1,2;
14,5,1,2,2,1,5;
42,14,1,5,2,2,5,1,14;
132,42,1,14,2,5,5,2,14,1,42;
The row n=3 represents 5=2*1+1*1+1*2, for example, where the middle term is not represented in the table.
CROSSREFS
KEYWORD
nonn,tabf,less
AUTHOR
Juri-Stepan Gerasimov, Jul 04 2009
EXTENSIONS
Definition and comment rephrased by R. J. Mathar, Sep 16 2009
STATUS
approved