A046533 First denominator and then numerator of 1/2-Pascal triangle (by row), excluding 2's.
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 5, 1, 3, 5, 1, 1, 1, 1, 7, 11, 11, 7, 1, 1, 1, 1, 9, 1, 9, 1, 11, 1, 9, 9, 1, 1, 1, 1, 11, 27, 1, 20, 1, 20, 27, 11, 1, 1, 1, 1, 13, 1, 19, 67, 1, 40, 67, 1, 19, 13, 1, 1, 1, 1, 15, 51
Offset: 1
Examples
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; ... with numerator/denominator exchange and without the 2's.
Crossrefs
Cf. A046213.