A049747 Array T read by diagonals; T(i,j)=number of directions from (0,0) to lattice points in first-quadrant portion of disk with radius (0,0)-to-(i,j).

0, 2, 2, 3, 3, 3, 5, 5, 5, 5, 9, 7, 5, 7, 9, 13, 11, 9, 9, 11, 13, 19, 15, 11, 11, 11, 15, 19, 23, 21, 17, 13, 13, 17, 21, 23, 31, 25, 21, 19, 17, 19, 21, 25, 31, 39, 35, 27, 23, 23, 23, 23, 27, 35, 39, 49, 41, 35, 29, 25, 25, 25, 29, 35, 41, 49

Offset

0,2

Links

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

Example

Diagonals (each starting on row 1): {0}; {2,2}; {3,3,3}; ...

Crossrefs

Sequence in context: A180101 A108035 A202503 * A260684 A029093 A369788

Adjacent sequences: A049744 A049745 A049746 * A049748 A049749 A049750

Keyword

nonn,tabl

Author

Clark Kimberling

Status

approved