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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A047071 Array T by antidiagonals: T(h,k)=number of paths consisting of steps from (0,0) to (h,k) such that each step has length 1 directed up or right and no step touches the line y=3x unless x=0 or x=h. 0
1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 3, 3, 1, 1, 1, 3, 6, 4, 1, 1, 2, 3, 9, 10, 5, 1, 1, 3, 3, 12, 19, 15, 6, 1, 1, 4, 6, 15, 31, 34, 21, 7, 1, 1, 5, 4, 15, 46, 65, 55, 28, 8, 1, 1, 6, 9, 15, 61, 111, 120, 83, 36, 9, 1, 1, 7, 15, 15, 76, 172, 231, 203, 119, 45 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..75.

EXAMPLE

Antidiagonals (beginning on row 0): {1}; {1,1}; {1,1,1}; {1,1,2,1}; {1,2,3,3,1}; ...

CROSSREFS

Sequence in context: A087917 A087741 A054991 * A124287 A253240 A290472

Adjacent sequences:  A047068 A047069 A047070 * A047072 A047073 A047074

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling

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 February 20 20:12 EST 2018. Contains 299385 sequences. (Running on oeis4.)