A046550 First numerator and then denominator of the elements to the right of the central elements of the 1/3-Pascal triangle (by row), excluding 3's.

1, 1, 1, 1, 4, 1, 1, 7, 1, 1, 5, 1, 10, 1, 1, 25, 13, 1, 1, 55, 38, 16, 1, 1, 31, 1, 18, 1, 19, 1, 1, 203, 49, 1, 73, 22, 1, 1, 350, 220, 95, 25, 1, 1, 252, 1, 190, 1, 105, 1, 40, 1, 28, 1, 1, 442, 1, 295, 1, 145, 1, 148, 31, 1, 1, 946, 1, 737, 1, 440, 1, 583

Offset

1,5

Links

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

Example

1/1; -->
1/1  1/1; --> 1 1
1/1  1/3  1/1; --> 1 1
1/1  4/3  4/3  1/1; --> 4 1 1
1/1  7/3  8/3  7/3  1/1; --> ...
1/1 10/3  5/1  5/1 10/3  1/1;
1/1 13/3 25/3 10/1 25/3 13/3  1/1;
1/1 16/3 38/3 55/3 55/3 38/3 16/3 1/1; ...

Crossrefs

Cf. A046534.

Sequence in context: A202687 A046554 A010321 * A363975 A355777 A223489

Adjacent sequences: A046547 A046548 A046549 * A046551 A046552 A046553

Keyword

tabf,nonn,less

Author

Mohammad K. Azarian

Extensions

Corrected and extended by Sean A. Irvine, Apr 13 2021

Status

approved