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A047030 Array T read by diagonals: 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=x/4 unless x=0 or x=h. 8
1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 3, 1, 1, 1, 4, 6, 4, 2, 1, 1, 5, 10, 10, 4, 1, 1, 1, 6, 15, 20, 14, 4, 2, 1, 1, 7, 21, 35, 34, 18, 4, 3, 1, 1, 8, 28, 56, 69, 52, 22, 4, 4, 1, 1, 9, 36, 84, 125, 121, 74, 26, 8, 5, 1, 1, 10, 45, 120, 209, 246, 195, 100 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,8
LINKS
M. Janjic and B. Petkovic, A Counting Function, arXiv preprint arXiv:1301.4550, 2013. - From N. J. A. Sloane, Feb 13 2013
EXAMPLE
Diagonals (beginning on row 0): {1}; {1,1}; {1,1,1}; {1,2,1,1}; ...
CROSSREFS
Sequence in context: A135225 A208891 A177767 * A047120 A096751 A293551
KEYWORD
nonn,tabl
AUTHOR
STATUS
approved

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Last modified March 2 21:08 EST 2024. Contains 370498 sequences. (Running on oeis4.)