login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110857 Table T(n,k), n>=0, k>=0, product M*M^(T) where M is the lower triangular matrix in A106566 and M^(T) denotes the transpose matrix of M, read by antidiagonals. 0
1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 2, 2, 2, 0, 0, 5, 4, 4, 5, 0, 0, 14, 10, 9, 10, 14, 0, 0, 42, 28, 23, 23, 28, 42, 0, 0, 132, 84, 65, 60, 65, 84, 132, 0, 0, 429, 264, 196, 171, 171, 196, 264, 429, 0, 0, 1430, 858, 618, 518, 490, 518, 618, 858, 1430, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,12

LINKS

Table of n, a(n) for n=0..65.

EXAMPLE

Matrix M:

1, 0, 0, 0, 0, 0, 0, 0, ...

0, 1, 0, 0, 0, 0, 0, 0, ...

0, 1, 1, 0, 0, 0, 0, 0, ...

0, 2, 2, 1, 0, 0, 0, 0, ...

0, 5, 5, 3, 1, 0, 0, 0, ...

...

Matrix M^(T):

1, 0, 0, 0, 0, 0, ...

0, 1, 1, 2, 5, 14, ...

0, 0, 1, 2, 5, 14, ...

0, 0, 0, 1, 3, 9, ...

0, 0, 0, 0, 1, 4, ...

0, 0, 0, 0, 0, 1, ...

...

Table begins:

1, 0, 0, 0, 0, 0, 0, ...

0, 1, 1, 2, 5, 14, ...

0, 1, 2, 4, 10, 28, ...

0, 2, 4, 9, 23, 65, ...

0, 5, 10, 23, 60, ...

0, 14, 28, 65, 171, ...

0, 42, 84, 196, ...

CROSSREFS

Diagonal sums : 1, 0, 1, 2, 6, 18, 57, 186, 622, 2120, ... see A000957.

Sequence in context: A212438 A112790 A179835 * A108867 A218604 A095767

Adjacent sequences:  A110854 A110855 A110856 * A110858 A110859 A110860

KEYWORD

nonn,tabl

AUTHOR

Philippe Deléham, Sep 17 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 21 06:31 EST 2017. Contains 294989 sequences.