A046215 First numerator and then denominator of 1/2-Pascal triangle (by row), excluding 1's.

2, 3, 2, 3, 2, 5, 2, 3, 5, 2, 7, 2, 11, 2, 11, 2, 7, 2, 9, 2, 9, 11, 9, 9, 2, 11, 2, 27, 2, 20, 20, 27, 2, 11, 2, 13, 2, 19, 67, 2, 40, 67, 2, 19, 13, 2, 15, 2, 51, 2, 105, 2, 147, 2, 147, 2, 105, 2, 51, 2, 15, 2, 17, 2, 33, 78, 126, 147, 126, 78, 33, 17, 2, 19, 2, 83, 2, 111, 204

Offset

1,1

Links

Table of n, a(n) for n=1..79.

Example

1/1; -->
1/1 1/1; -->
1/1 1/2 1/1; --> 2
1/1 3/2 3/2 1/1; --> 3 2 3 2
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: A086757 A369690 A166985 * A256113 A256368 A057019

Adjacent sequences: A046212 A046213 A046214 * A046216 A046217 A046218

Keyword

tabf,nonn,frac,less

Author

Mohammad K. Azarian

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Apr 06 2000

Status

approved