A046217 First numerator and then denominator of 1/2-Pascal triangle (by row) excluding 1's and 2's.

3, 3, 5, 3, 5, 7, 11, 11, 7, 9, 9, 11, 9, 9, 11, 27, 20, 20, 27, 11, 13, 19, 67, 40, 67, 19, 13, 15, 51, 105, 147, 147, 105, 51, 15, 17, 33, 78, 126, 147, 126, 78, 33, 17, 19, 83, 111, 204, 273, 273, 204, 111, 83, 19, 21, 51, 305, 315, 477, 546, 477, 315, 305, 51, 21, 23

Offset

1,1

Links

Table of n, a(n) for n=1..66.

Example

1/1; 1/1 1/1; 1/1 1/2 1/1; 1/1 3/2 3/2 1/1; 1/1 5/2 3/1 5/2 1/1; 1/1 7/2 11/2 11/2 7/2 1/1; 1/1 9/2 9/1 11/1 9/1 9/2 1/1; 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ...

Crossrefs

Cf. A046213.

Sequence in context: A335074 A239931 A033558 * A057662 A015971 A163167

Adjacent sequences: A046214 A046215 A046216 * A046218 A046219 A046220

Keyword

tabf,nonn,easy

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 13 1999

Status

approved