A046221 Odd numbers on numerators of 1/2-Pascal triangle (by row).

1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 5, 3, 5, 1, 1, 7, 11, 11, 7, 1, 1, 9, 9, 11, 9, 9, 1, 1, 11, 27, 27, 11, 1, 1, 13, 19, 67, 67, 19, 13, 1, 1, 15, 51, 105, 147, 147, 105, 51, 15, 1, 1, 17, 33, 147, 33, 17, 1, 1, 19, 83, 111, 273, 273, 111, 83, 19, 1, 1, 21, 51

Offset

1,8

Links

Table of n, a(n) for n=1..72.

Example

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

Crossrefs

Cf. A046213.

Sequence in context: A179680 A123562 A046218 * A220837 A187371 A056611

Adjacent sequences: A046218 A046219 A046220 * A046222 A046223 A046224

Keyword

tabf,nonn,frac,less

Author

Mohammad K. Azarian

Extensions

More terms from Sean A. Irvine, Apr 07 2021

Status

approved